Start Searching the Answers
The Internet has many places to ask questions about anything imaginable and find past answers on almost everything.
Electric furnaces range from 10 kilowatts to 50 kilowatts, we estimate that a 2,400 square foot home using a modern high efficiency electric furnace uses 18,000 watts for heating when the furnace is being used.
As a general rule, 1KW of heat is required for every 14 cubic meters (494 cubic feet) of room space if the room has average insulation values.
Selecting Heater Size In a living room you will need 100 watts per m²: 1,000 watts (1kw) per 10m². In a bedroom you probably only need 75 watts per m²: 750 watts per 10m². You need to find out the area in square metres of your room.
150 square feet
As a rule of thumb, you’ll need roughly 10 watts of heating power for every square foot of floor area in the room. This means that a 1,500-watt heater can be the primary heat source for an area measuring up to 150 square feet.
Heat Pumps will raise your electricity bill – but lower your costs for other heating fuels. Each single unit (often referred to as a one-to-one) heat pump that is used daily will increase your electricity bill by $50 to $100 per month.
An electric space heater is small but uses a lot of energy! A 1,500-watt heater running for eight hours each night for a month can add about $43 to your electric bill. Running multiple space heaters can run up your energy costs. Consider air sealing and adding insulation if your home is drafty.
The 2kW and 3kW under-sink models have capacities of 10 and 15 litres, while the 3kW over-sink units are available with capacities of 10, 15 and 30 litres. (Note: These capacities refer to the volume of cold water each unit holds; the volume of hot water delivered may be slightly less.)
A 1500 watt space heater can heat an area of 150 square feet, and a 5000 watt garage heater can comfortably heat an area of 400 square feet.
For most small- and medium-sized rooms, a 2kW device will suffice. According to the Centre for Sustainable Energy, a 2kW convector or fan heater will cost 28 pence per hour to run; a typical 1.5kW oil-filled radiator will set you back 21 pence per hour; while a 1.2kW halogen heater costs around 17 pence per hour.
Infrared heaters can be hotter to touch, but better for your overall health than ceramic heaters. And, lastly, ceramic heaters come out on top when it comes to heating up larger spaces, while infrared heaters are more efficient at heating small or localized living areas.
Dirty filters restrict air flow and cause the system to run longer to heat the house. This causes a higher electric bill. Dirty filters over a period of time or a lack of filters at all can result in dirty coils. If the heat pump isn’t working, the electric furnace is running by itself to heat the house.
For an estimate of how much heat you need for a room, please use the guide below. Please note the calculations returned should be taken as a guide only and are not detailed heat loss calculations.
meaning that the water would be heated in 1 hour by 3.5kW of applied heat. Also we can use this information to extrapolate both ways. To heat the same water volume in half the time (30 minutes) would need twice the heating power, ie, 7kW.
Let’s make a calculation example for a tub with 250 us gallons that cools down from 105f to 103f in 2 hours. Using the “Water Heating Power Calculator” above (250 us gallons, start temperature 103f, end temperature 105f, 120min) tells us that a heating power of 611 watts is required.
In more moderate climates, multiply by 20 – 30. And in cold climates multiply the square foot number by 30 – 40. For example, if you’re trying to heat 1000 square feet in a cold climate, 30,000 – 40,000 BTU’s will add significant warm air to your home.