Sample Calculations
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When calculating the number of watts required for a property this is determined by how old the property is, if the property has adequate insulation and if the windows are single or double glazed.
The average for a well insulated modern property with double glazing is 25wm3. This is the length of the room multiplied by the width of the room multiplied by the height of the room. (L x W x H). This figure is then multiplied by 25 watts which will give you the wattage required for the room.
Infrared heats the thermal mass of the room and once the room gets to temperature then this just needs to be topped up. We estimate an average of 6 hours per day is required with a heating season of 180 days*
Convection heating requires on average 40-50wm3
|
Insulation Level |
House Type |
Watts per m/cubed |
|---|---|---|
|
Passive building |
Airtight property |
8 wm3 |
|
New building |
Post 1983 |
20 wm3 |
|
Modern building |
Post 1940 |
25 wm3 |
|
Old building |
Pre 1940 |
w30 wm3 |
Example 3 bedroom modern 213m3 property
|
Number of Panels |
Watts per panel |
KW usage per year |
KW usage per year at 6hrs per day |
Cost per yr at £0.13p per kWh |
|---|---|---|---|---|
|
6 |
800w |
9120 kW** |
2280 kW |
£296.40 |
|
2 |
350w |
1270 kWh*** |
317 kW |
£41.21 |
|
8 |
|
10, 390 kWh |
2597 kW |
£337.61**** |
