If however you heated with electricity, then with tier two at 12 cents per KW, electricity would likely be more expensive. Take a few minutes to use this Savings Calculator to find out how much money you can save in one year and in 20 years. Kitchen equipment. 9 amps for amperage load and 460 volts 3 phase and power factor value is 0. Sub-metering Bill Calculator. Gas Tankless Water Heaters. For instance, the heating elements in electric tankless water heaters installed in residential applications demand electricity in the range of 2. heat exchanger calculator The Heat Exchanger Calculator is a program specially designed to predict the performance of the heat exchanger Model Number you choose based on the parameters you input. The Goodman 15 KW Electric Furnace (51,180 BTU's) is nowadays counted as one of the most reliable, efficient and versatile means of combining the dual comfort of highly energy efficient heating &cooling performance with safety, convenience and high customer satisfaction. The list will help you decide if changing fuels is a good idea, or if increasing the efficiency of the heater you buy is a good idea. These figures are not accurate calculations as different house sizes and other factors must be taken into consideration. The 3 phase Induction motor is popular for its efficiency and is widely employed in the electric systems for doing […]. They include permanent baseboard heaters or portable heating units, and may feature forced air or radiant heating. Calculate the cost of operating a heater of 500 W for 20 hours at the rate of 35 paise per unit. Baseboard Heater Basics Baseboard heaters are mounted at the bottom of walls and are powered by electrical circuits via wiring that is usually routed through wall cavities to the main service panel. The kilowatt hour (kWh) measures your energy use and comes from the readings on the meter attached to your home. EcoSmart Electric Tankless Water Heater 36 kW 240-Volt Self-Modulating 6 GPM in White. The desired temperature change is the necessary increase/decrease from outdoor temperature to reach the desired indoor temperature. Thankfully, there is there is a fairly simple formula for the most popular type of installation and layout. Electric Heating vs Gas Heating comparison. Shop electric water heaters in the water heaters section of Lowes. If, however, you're using the space heater to heat an area normally not heated such as an. Air heaters are electric heaters used to heat air in an enclosed volume or in tandem with a fan system for distribution throughout a building. An electric unit heater from Grainger is a simple, rugged answer to heating large work areas. Even during the run cycle of a motor, if the voltage is low it will. 220, Part II, involves more steps, but many people. Convert the 150 kW to BTU (British thermal units) as these are standard to air conditioning and air heat exchangers. Heat Converter Specific heat capacity is the amount of heat required to raise the temperature of a particular substance of mass (kilogram, gram, pound) by 1 degree (celsius, fahrenheit, kelvin). * The pool heat pump sizing calculation is based on a maximum temperature. However, many Dimplex portable heating devices come with the latest thermostatic control which can reduce running costs from as much as 30%. ★>>ThermoBoost 14kW/240V 2. 7% in comparison to the typical fifty-gallon electric. The calculations are based on each heater having a power output of 3kW, and operating for 5 hours a day for about one third of a year. Get in touch with us. The higher the kilowatt rating of a heater, the more expensive it is likely to be to run, although it will heat a space more quickly. Electric Heater Formulas Conversion Locate Heater Rated Voltage. Include the air handler when using either one. If the room has stairs leading off it, is badly insulated, or has many windows/doors then you will need to adjust the heat output needed upwards. Enter the total heated area in the box. Energy and cost calculator for heating water. You can use 6mm cable for up 9. 5 kWh in one hour. Contact factory for silent relays with three phase electric heat. Online Usage Calculator To calculate an estimated monthly electrical bill for your home, please select a QUANTITY in the applicable Electrically Powered Items field. A gas heater can heat a 50- gallon tank in about one hour. 3GPM Electric Tankless Water Heater by Atmor Industries Ltd. Voltage AMPs per kW 115/1 8. nec continuous load calculation for electrical system design Several NEC sections contain the very important requirement to size conductors and overcurrent devices at 100% of the noncontinuous loads plus 125% of the continuous loads. 6° per hour with the 1. Home / Download Center / Electrical Software / Calculate Size of Solar Panel, Battery Bank and Inverter Calculate Size of Solar Panel, Battery Bank and Inverter Design of solar panel / battery bank and inverter. Sizing Storage and Heat Pump (with Tank) Water Heaters. Electric Heaters Types. In the case of propane and natural gas you will require a licensed gas fitter and in the case of an electric heater or heat pump a licensed electrician. Minimal maintenance makes electric heaters even more desirable. eg Electric Stove, Fixed lighting, Ceiling Fans, Electric Hot Water Service, larger air-conditioning units etc. Calculate Volts, Amps, Watts and Ohms. ) Select the lamp wattage (lamp lumens) Enter the number of lights in use; Select how long the lamps are in use (or click to enter your own; enter hours on per year). The Heating Unit shall conform to Australian Standard 3498 and be WaterMark certified and shall have a sunshield suitable for outdoor applications. located in the electrical enclosure before connecting power. Air heating systems may be cost effective if they can be made simple or if they can be combined with a ventilation system. Calculator Instructions. VAV with electric heater TER Reheat Selection Chart 1) Locate the room heat loss on the MBH scale on the far left side of the chart. Your monthly electric bill is based on consumption, and that consumption is denoted in kilowatt-hours. 293 = Watts Determine % of hot water portion of total mixed water requirements M-C = 140-40 = 100 = 71. The total is the Kilo-. Hours used in month (use an average) Hours: 4. This calculation (heat output wattage x square footage / 1,000 = kilowatt load) is a constant for kilowatt load that will remain unchanged regardless of duration as long as the system is on. Efficient designs. It is very important that you use the correct values for a reliable estimate. If we know the electrical power (kW) of the electrical equipment. Take these figures into consideration when receiving quotes from installers. When using the conversion calculator on this page then it's important to also remember that it takes more energy (heat) to heat a room from cold that it does to. Power Calculators for quick electrical generator power consumption, sizing, and unit conversion. Thankfully, there is there is a fairly simple formula for the most popular type of installation and layout. To calculate the overall wattage required you need to calculate the wattage for process start-up, process operation and heat loss. 14 kW range. With over a decade of experience to guide us, we’ve curated a highly reliable and staggeringly varied collection of garden heaters and outdoor patio heaters for your garden or outdoor area in the home or commercial setting. How to Calculate Electric Loads for Baseboard Electric Heaters | eHow. First, use the FurnaceCompare. Please input information about your induction heating application. Electric Heater Duty Calculator. How to calculate the BTU output of an electric heater using the SuperCool Slide Rule. A typical home natural gas furnace is rated at 75,000 Btu/hr. But - be aware that due to the low specific heat of air the use of air for heating purposes is very limited. Heaters designed specifically for heat transfer fluids. Amps to kW calculator DC kilowatts to amps calculation. A 230 V electrical appliance has a power rating of 1. Multiply Heater Rated KW by Factor Shown to Obtain Actual. Electric Radiator Calculator The calculator gives the total minimum wattage needed to heat your room: choose one radiator or mix and match smaller radiators to reach or exceed this figure. If left on for 1 hour, it would cost 12. To estimate how much time it takes for heating you should enter power of electrical device which you use to heat water. How do I calculate the needed size of heater. To protect against material failures, the National Electric Code. This information is intended for comparison purposes only. Such an appliance essentially consists of a conductor whose resistance is chosen so as to produce the desired amount of resistive heating. Our radiator calculator helps you to find the BTU, KW (heat output) required for your room size so you can buy the correctly sized radiator for your room. Multiply your electric rate (0. Source Voltage. Homes that are poorly insulated may require 10% more BTUs to heat due to heat loss. Large Electrical Clearances - Generous electrical clearances between the coil and frame enable open coils to withstand severe applications such as subway car heating, where voltages may exceed 750 volts. • One million Btu’s is the heat equivalent of approximately 7 gallons of No. Efficient designs. Modine electric unit heaters provide a wide variety of options in solving comfort-heating problems as well as an excellent alternative heat source depending on utilities available, size of application, and environment the heater is to be located within. choose the right tankless electric water heater for you. Unfortunately your question is a bit like asking if there is a kind of pipe that will produce more water out one end than you put in the other. How to buy storage heaters. It delivers all the hot water you need and because it uses the same water and electric connections, installation is fast and easy. Assuming that all the 2. Warmup electric heating mats come in two forms: the StikyMat and the DCM-PRO. For greater ease we explain which formula is used for the conversion, how to perform the calculation in 1 single step , some examples , and a table with the main conversions from kW to kVA. The first step towards reducing your heating bills and carbon footprint is understanding how much energy you use to heat your home. Estmation of needed power. Locate Actual Applied Voltage. VAV with electric heater TER Reheat Selection Chart 1) Locate the room heat loss on the MBH scale on the far left side of the chart. Single Family Dwelling Load Calculation - Step by Step Example (Optional Method) CEC 220. , you can add these items. It is easier, work wise, to move heat than to create it. CF Series Electromechanical General Purpose Water Heaters. 06160 in the US; across the board, that averages $0. We'll show you a list of radiators that will generate enough heat to keep your room at an efficient yet comfortable temperature. The consumption of electric energy is measured in terms of watt-hour. For those in search of an efficient and convenient heating unit, look no further than electric heaters. Use copper conductors only. 65 Tons of Air conditioning is equal to the enegry you produce at 150 kW of heat. Depending on your geographic location and your utility rate plan you could be paying as little as $0. Measure the supply voltage to the air handler and record the value. Electromax is the combination of an electric flow boiler with a hot water storage cylinder and a pre-plumbed, factory fitted circulating pump. From heating and ventilation to electronic controls, Stelpro is your global comfort solution to enhance your living environment. They feature ultra slim depth, low profile feet fit discreetly under carpet, concealed easy to use controls and a durable willow white cabinet finish that makes this storage heater an extremely popular choice. Our complete line of heaters are cross-compatible for a variety of heating applications, from greenhouse heating to warehouse and garage heating and everything in between. • One million Btu’s is the heat equivalent of approximately 7 gallons of No. This wire size calculator will calculate the appropriate wire gauge for a circuit based on amps, voltage, distance, and load. 00 The Sunhouse range of storage heaters are attractive, stylish, economical & simple to operate. The key to selecting the right heat pump for Heating your home is to choose the correct unit size. Calculate the energy used in kWh. It is also known as the current and is measured in amperes, an SI unit named. Learn how to convert among power and heat flow rate units. Electrical Requirements NOTE: All outdoor wiring must be weatherproof. If any questions or concerns, please feel free to contact our technical support at 877-474-6473. Once the 1 Hp electric motor has started, it will only consume 1 kVA leaving a extra 2-3kVA available for other appliances. Electric power is defined as the amount of work done by an electric current, or the rate at which electrical energy is transmitted. Each Kw produces about 3400 Btu's of heat, so the heating output of the various heat strip options are as follows. Based on heat pump efficiency of COP = 5, and electric cost of $0. At initial cold water startup the heat pump may need to run for a longer period per day to reach the set temperature. Once you make your calculations, you can decide on the best choice for a type of heater and how many BTUs (British Thermal Unit, the standard heat measurement) you need. Direct tank heating consists of placing the heater in direct contact with the heated medium by placing the heater directly in the tank or circulating the fluid directly through. Assume the heating kilowatt rating is equivalent to kilovolt-amperes. A BTU (British Thermal Unit) equals the energy needed to raise the temperature of one pound of water by one degree F. 3 Hybrid Water Heaters A hybrid water heater (see Fig. If we know the electrical power (kW) of the electrical equipment. A kilowatt hour (kWh) is a measure of energy. Our complete line of heaters are cross-compatible for a variety of heating applications, from greenhouse heating to warehouse and garage heating and everything in between. (square foot) of duct heater) to the kW rating on the table at the rated air. After this information is known, the following calculations can be made: A x 1. This is a measurement of the amount of energy you use during the billing period. AC three phase amps to kilowatts calculation Calculation with line to line voltage. So to run 11kw worth of conventional Electric Heating, against the 2. With the correct sauna heater, the warm-up time should be 20 to 30 minutes. The key to selecting the right heat pump for Heating your home is to choose the correct unit size. Plate Heat Exchanger brazed in stainless steel 30,50 and 75 kW at 55°C These plate heat exchangers have been made to heat bathing water with warm water. W/in2 = Rated Watts ÷ Effective heating area The effective heating area is the surface area per linear inch of the heater multiplied by the. Electric water heaters For those places where conventional fuel is unavailable, or where ease of installation is a conscious choice, A. The formula used to determine the amount of CFM, or cubic feet per minute, a room needs for heating begins by multiplying the room's volume by the number of times the heated air gets changed hourly. The higher the kilowatt rating of a heater, the more expensive it is likely to be to run, although it will heat a space more quickly. KW Liquid Tank Heating: Calculation Form To determine kW required to raise the temperature of any Liquid, complete the fields below. Conservation of energy theorem is also applied to heat transfer. How to calculate the amount of kilowatt hours (kWh) your solar panel system will produce. The Cost of Heat Cost Comparison: Electric (Resistance) vs. Therefore, in the preceding example, if the load bank terminal voltage is reduced to 473v, then the resultant KW will be 97% of the rated KW. Always practice electrical safety and call 8-1-1 or visit NDonecall. 5 kWh in one hour. Example : We have 1 unit Induction Motor with 30 horsepower (hp),running with 34. Each arm has a total resistance of 17 ohms and the coil is of Nichrome. The size of the property and the heating requirements will determine what kilowatt output is needed. Calculator Instructions. KW Calculations for Process Heaters: (See tables below for properties of commonly heated mediums) *Important Note: This calculation is provided for reference purposes only, and must not be used for any other purpose. (Specific heat of water C = 4200J/kg/ o C). Compare the estimated annual costs of your current heating type with other heating options. is the kilowatt hour (kWh). VAV with electric heater TER Reheat Selection Chart 1) Locate the room heat loss on the MBH scale on the far left side of the chart. For more detailed running cost examples please visit our Cost of Running An Electric Heater page. Enter the device name, the quantity of devices, the consumption factor, the time of usage and the cost of electricity per kilowatt hour, as of 3/15/2007, nationally the residential average is currently $0. However, if you do use an electric space heater, a lower wattage 600 watt unit with overheat protection and tip-over shutoff will be safer electrically. One kWh (kilowatthour) = 3412 BTU. If you don't know the VA, but know the amps, wattage or voltage of your appliance, calculate the VA here. In the case of propane and natural gas you will require a licensed gas fitter and in the case of an electric heater or heat pump a licensed electrician. From this calculation it can be reasoned that a 1000 watt heater would be required. Multiply Heater Rated KW by Factor Shown to Obtain Actual. A one KW heater will produce 3,413 BTU's per hour. Calculate Volts, Amps, Watts and Ohms. To use this tool, please visit the page from your desktop or tablet. 4564 per therm. A single centrally located heater can protect up to 300 square feet of basin surface area from ice damage. A 230 V electrical appliance has a power rating of 1. When you consider we do 6 loads of laundry a week (family of 4) the numbers really start to stand out. If you know the CFM of your air handler and the temperature rise needed, you can use the chart below to approximate the KiloWatt rating of the duct heater needed for your application. Fuels (Natural Gas, Propane, Oil). The average annual electrical energy consumption of a household in the United States is about 8,900 kilowatt-hours, equivalent to a steady power consumption of about 1 kW, for an entire year, Also, kilowatts of light power can be measured in the output pulses of some lasers. Your monthly electric bill is based on consumption, and that consumption is denoted in kilowatt-hours. The power P in kilowatts (kW) is equal to the current I in amps (A), times the voltage V in volts (V) divided by 1000:. Multiply the wattage of your unit by 3. Heat Pump Calculator 1. Our electric heater reviews put your comfort and safety first. VAV with electric heater TER Reheat Selection Chart 1) Locate the room heat loss on the MBH scale on the far left side of the chart. Visit the solar water heaters page for more on these calculations. Energy Required To Heat 1000 Gallons Of Water. Eemax is the #1 supplier of tankless water heater solutions. Thermal Equipment Sales Stocking Distributers for electric heaters, and controls, temperature, level, density, speed, photoelectric, time, proximity. Our green, environmentally friendly water heaters offer the largest selection in the industry. 4 x 105 J of heat energy, calculate the current taken from the supply. 5kW to the largest at 2kW all with built in highly accurate thermostatic controls. 99 per watt. 4kW heater with a 2. The current charge for natural gas from WPS is $0. The figures shown are for applications where a temperature is being maintained; this calculator does not show calculations for raising a pipe to a specific temperature. This is a measurement of the amount of energy you use during the billing period. Once you make your calculations, you can decide on the best choice for a type of heater and how many BTUs (British Thermal Unit, the standard heat measurement) you need. Heat Pump with 7. Basic KW Calculation: The most basic calculation for Demand is: Calculating Demand from Pulses: If you are trying to calculate Instantaneous Demand and have a pulse meter, try this equation:. My main electrical service is 200 amp. 1 kW-h = 3. 9-GPM Point of Use Tankless Electric Water Heater A. To calculate the KW required to maintain the temperature of a tank you will need to determine the tanks surface area, process temperature to be maintained, minimum ambient temperature and the R-value of the insulation. Fixed appliance loads, such as dishwashers, disposals, water heaters, compactors, etc. 220, Part II, involves more steps, but many people. Residential electricity prices vary widely across the U. Branch-Circuit, Feeder and Service Calculations, Part LVI. To calculate kilowatt hours for an appliance, first find the wattage on its label by looking for a number listed as "W. I want your help to know how i can calculate the power in KW of a 3 phase heater when connected in star and delta. This wire size calculator will calculate the appropriate wire gauge for a circuit based on amps, voltage, distance, and load. 2kw drawn by the Air Source Heat Pump, would cost £1. Convert to kW by moving horizontally to the right to the kW scale (1 kW = 3. Part of the reason for this is because a tank heater continually heats water whether or not it is actually being used. (square foot) of duct heater) to the kW rating on the table at the rated air. If you know the horsepower, but not the VA, find it here. Did you find us useful? Please consider supporting the site with a small donation. Energy Information Administration, in 2011 most people in the country spent 11. Electrical; Single & Three Phase Line kVA calculator is an online tool used in electrical engineering to measure the unknown quantity by two known quantities applied to the below formulas for single phase and three phase connection. The SI unit of electric power is the watt. Following is the formula how to calculate Motor loads. Calculating the Cost of Steam Generation. The first hour rating is the number of gallons of hot water the heater can. It can move 2 kw of heat for each 1 kw of electrical energy that the heat pump consumes. This is a general rule and an outdoor sauna or a sauna built on outside walls may need to have the heater oversized. Each can reduce your hot water heating bill, but there are cost and limitations with these systems. I am programming an app for ordering 3 phase heaters, and I have an argument to resolve with a coworker. There are minimal special requirements for this heat resource, as the heat would otherwise be vented to atmosphere. Convert to kW by moving horizontally to the right to the kW scale (1 kW = 3. 05585 joules. There are two types of electric heaters used in air han-dling equipment, open element and finned tubular. 3% over the past two years, in line with its 5% to 7% earnings growth range. 66 cents per kilowatt hour in Louisiana to rates as high as 32. Step 2: Calculate the required KW: [3333 SCFM x (400°F-350°F)]/3193 = 52 KW. Electric Heating Mats. 5 kW dishwasher. The appliance load includes a 12 KW range, a 12 KW double oven, 20 amp Sub Zero refrigerator, 15 amp trash compactor, two 8 amp garbage disposals, 30 amp warmer drawer, 5. Keep in mind that the 36 KW tankless water heater requires a minimum of a 300 Amp service panel for the entire home, four double pole 40 Amp breakers, and four sets of 8/2 wire. The calculator below helps you to work out how much it costs for the electricity to run various household appliances. " Multiply that number, or a number in the middle if a range is given, by the number of hours you use the appliance each day. 3 kW output) will use approx. heat exchanger calculator The Heat Exchanger Calculator is a program specially designed to predict the performance of the heat exchanger Model Number you choose based on the parameters you input. ★>>DVE-120-30 Commercial Tank Type Water Heater Electric 120 Gal Gold Xi Series 30KW Input by A. KWH can be used to determine which fuel is most efficient by measuring the heat output of each fuel. Sizing a Sauna Heater. One kwh is consuming power at a 1,000-watt rate for a full hour. We pride ourselves on superior application engineering assistance - just a phone call away. They are more accurate at higher flow rates, and larger CF models are more accurate than smaller models. One kWh (kilowatthour) = 3412 BTU. Heat Pump Calculator 2. Whether you're on a Standard or Time-of-Use pricing plan, the calculator below shows an estimate of your baseline allowance using a value of 30 days in your billing cycle, which changes monthly. NOTE: To prevent element section from moving inside duct, angle clips, brackets, or blank offs should be attached to frame. If left on for 1 hour, it would cost 12. If the operating times run past midnight, the extra hours are calculated as part of the same day. Foundation heat loss I do not have it in front of me but the ASHRAE Fundamentals Handbook has a manual calculation for foundation heat loss that is easy to use. OFWF means “Oil Forced Water Forced” cooling in transformer. ” −Chemist’s “calorie” (lower case c) is the energy needed to raise 1 g of water 1 degree C. 80 per week!. In this set of calculations, an electric water heater is assumed. 45 ohms-mm-3 Density = 7. kw as a function of voltage (de-rating) KW varies as the square of the voltage change and can be calculated using the following formula: KW output = Rated kW x (Applied Voltage/Rated Voltage)2. In addition, locations with low electric rates are prime candidates for heat pumps. Divide 2700 watts by 240 VAC to find the amperage of the non-insulated space. The ongoing wattage required for all tools and appliances you want to run. Size branch-circuit conductors and the overcurrent protection device for electric heating to not less than 125% of the total heating load, including blower motors. DETERMINING ELECTRIC MOTOR LOAD AND EFFICIENCY Most likely your operation’s motors account for a large part of your monthly electric bill. kW to amps calculator DC amps to kilowatts calculation. of Propane (4. A BTU, or British Thermal Unit, is the quantity of heat required to raise the temperature of one pound of water by one degree Fahrenheit. This heat resource is easily assessed as the waste heat specifications are well documented. When you consider we do 6 loads of laundry a week (family of 4) the numbers really start to stand out. 5 KiloWatt heating Element. Using the Power Converter Converter. 5 amp pool pump and two a 30 amp condensing units. Heating Load Requirement Graphs for Air. An electric heater is used every day for 120 minutes. Compare between heat and cooling- eliminate the smaller. Selecting whole house provides a backup generator recommendation based on your home's size and corresponding outlets and lighting requirements and assumes natural gas appliances in the baseline calculation. Imperial/Metric. Far too often motors are mismatched—or oversized—for the load they are intended to serve, or have been re-wound multiple times. To calculate the overall wattage required you need to calculate the wattage for process start-up, process operation and heat loss. A (ft²) = (2 x p x r x h) + (2 x p x r²) p = 3. Heat flow, on account of energy transfer occurs from a difference in temperature. Heat Transfer Fluids allow for heating another medium without direct contact between the electric immersion heater and the heated medium. The electric furnace heating element options are displayed within the electric furnace pricing. 101, Vancouver, Washington 98665 HOW TO CALCULATE BREAKER SIZE, WIRE SIZE AND WATTAGES The chart below will help you determine fuse or breaker size and the necessary wire size to service various wattage loads. They may operate on either 120 or 240 volts, depending on the amount of heat required and the size of the space to be heated. 19 cents per kilowatt hour (kWh). Home › Support › Resources › Electrical References › Calculations › Electrical Formulas Electrical Formulae for Calculating Amps, Horsepower, Kilowatts, & KVA Use the chart in this calculation guide to find the formula you need according to the measure you will calculate. Make sure all heating stages are energised. HEAT REJECTION - kW. Local gas cost may vary. In accordance with the PJM RAA and PJM rules and procedures, BGE will calculate a system capacity peak load contribution (capacity PLC) “ticket” for each electric account on an annual basis. Calculating Wattage for Industrial Heating Applications. Do not use this calculator to size a system for purchase; a licensed HVAC contractor or engineer should be consulted when designing a new system. 82(A)&(B) in the 2014 National Electrical Code (NEC). These heaters are made in our factory in Australia using high quality and safe heating elements. An electric hot water heater’s impact on your bill August 25, 2011 | Filed under: Summer hot water heating , Uncategorized , Ways to Save Changing one thing in your household (like plugging in a car or a new plasma TV) can impact your electric bill. Take the guesswork out of garage heater sizing. 2) Calculate the kW required to heat the primary air to room temperature using the following equation:. How do we Calculate Temperature & Time of Heating Element Heating Wire having the following Data : SWG 16(1. 0 toasters, unit heaters, base board heat use actual wattage Basic Electrical Fundamentals Voltage, current kilowatts, kilovolt amps. What is the demand load for a 15kw range that operates on 240 volts? this load calculation for? 2-Ton Heat pump with a 15 KW Electric Heat accessory and a. Given all the different options available for heaters -- space, vented, gas, console, and more -- narrowing down the choices can be a great way to ensure that you are choosing the best option. get it to day. Electrical Energy Cost Calculator. Use the swimming pool heater size calculator below. The current I in amps (A) is equal to 1000 times the power P in kilowatts (kW), divided by the voltage V in volts (V):. Convection space heaters heat up a room by heating up the air, most common convection space heaters will use around 1500 watts. The branch circuit conductor supplying a 10 hp 3 230v motor shall have an ampacity of at least amps. It uses CIBSE recommended criteria for UK conditions for heating calculations which are -3 to +18 degrees Celcius. Sizing Storage and Heat Pump (with Tank) Water Heaters. By simply providing us with some basic information, we can email your personalized generator size results to you. Learn how to convert among power and heat flow rate units. Calculation − Round cables and wires: • Diameter to cross section and vice versa • Electric voltage V = I × R (Ohm's law VIR) Electrical voltage = amperage × resistance (Ohm's law). Imperial/Metric. The Cost of Heat Cost Comparison: Electric (Resistance) vs. 5 Kw of electric power continuously. A small electric heater with one heating element can use 1.