Heatcalc
●
1
Read off the number that corresponds to your rooms Floor Level and Room Height.
Multiply by Floor Area to give subtotal ARead off the number that corresponds to Outside Wall Type and Room HeightMultiply by Length of Outside Wall(s) to give subtotal BRead off the number that corresponds to Window Type and Outside Wall Type Multiply by Area of Window(s) to give subtotal C
2 3 4
Add subtotals A + B + C to get TOTAL DIf any of the variations (described below) apply, adjust accordingly.
TOTAL D is the heat output (in Watts) required from one or more contemporary radiators to heat a living room to a
temperature of 21C (70F) when the outside temperature is -1C (30F) . Each radiator in this catalogue
is listed with its heat output.
Photocopy the chart before use, if you wish to make calculations for more than one room.
Floors with
Insulation: HEATCALC assumes that floors in Basements/Ground
Floor rooms and Single Storey buildings are not insulated.
If they are insulated multiply subtotal A by 0.78. Party
Architectural walls / Internal Walls: HEATCALC assumes that party walls and internal walls
have heated rooms on the other side. If the room on the
other side is not heated, use this
contract table: ●
As every room and central heater system is different, and the number of variables is so great, you mustcheck your heat requirement figure and choice of radiator with the plumber responsible for the installation.
Attic Room with Sloping Walls or Ceiling: There are endless permutations to such rooms. For a
rough assessment, we suggest you take an average
height, and treat it as a normal room. Velux
Windows manufacturers /
Skylights manufacturers: VARIATIONS Cooler Bedrooms, Halls or Other Rooms: For cooler room temperatures 16
C (60
F).Multiply total D by 0.75 Exposed Situations: To allow for an outside temperature of -5
C (23
F) inexposed rural areas, multiply total D by 1.2 Internal Rooms With
Fan furniture Extraction (eg internal bathroomsor
architectural kitchens): Multiply subtotal A by 2. Ignore steps 2 & 3.
ROOM HEIGHT IN METRESLENGTH ADD TO2.4 2.7 3.03.33.63.94.2OF WALL TOTAL69788695108117126IN METRESD Internal Rooms Without Fan Extraction (eg internal landings/ passageways): Use step 1 only.
X
=
Rooms With 2 or More Different Outside Wall Types: Single Storey Buildings (Bungalows, extensions etc): At step 2 calculate each wall type separately, and add together to get subtotal B. At step 3 calculate the windows
in the appropriate wall type separately, and add together
to get subtotal C. In step 1 use Ground Floor and multiply subtotal A by 1.1
Ceilings suppliers without Insulation on Top Floors and Single Storeybuildings: HEATCALC assumes that ceilings on Top Floors andSingle Storey buildings are insulated. If not insulated multiply total A by 2.
SINGLEGLASS158AREA OF GLASSADD TODOUBLE GLASS88IN SQ. METRESTOTAL D X
=
All Window Walls: Ignore steps 2 and 3 and use this table.
SINGLEGLASS138AREA OF GLASSADD TO
DOUBLE GLASS74IN SQ. METRESTOTAL D X
=
53 BISQUERADIATORS
Bisque Limited