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Technical Support - Water Heating and Heating

PHYSICAL CONSTANTS - IMPERIAL

1 gallon water = 8 pints = 277 cu.ins. = 10lb = 4.54 litres.
1 cu.ft.= 6.25 gallons = 62.5lb fresh water.
1 British Thermal Unit is the heat required to raise 1lb of water through 1 degree F
1 Kilo-calorie is the heat required to raise 1 kilo of water through 1 degree C.
1 British Thermal Unit = 0.252k calories = 17.5 watt minutes.
1kW hour = 3410 British Thermal Units = 860k calories.
1 kilogram = 2.2lb = weight of 1 litre of water = 1000 cu cms = 0.22 galls = 61 cu.ins = 1.76 pints 1 foot head of water = 0.434lb per square inch pressure.

PHYSICAL CONSTANTS - S.I.

1 Metre(m) = 3.28 feet.
1 Litre (L) Water = 1,000 cu.cm (cm 3 ) = 1 kilogram (kg) = 0.22 gallon.
1 Cubic Metre (m 3 ) = 1,000 kilograms fresh water.
1 Kilo calorie (C) = 4,187 Joules (J) = 3.97 BTU.
1 Joule )J) = 1 watt second (Ws).
1 Kilowatt hour (kW hour) = 3,410 BTU = 3.6 Mega Joules.
1 kilogram = 2.2lb = weight of 1 litre of water = 1000 cu cms = 0.22 galls = 61 cubic inches = 1.76 pints.
1 Newton = 9.807 kilogrammes force (kgf) = 4,448 lb. sq in.
1 Metric head of water = 9.8 kilonewtons per sq metre (kN/m 2 ).

RECOVERY CHART

Approximate time in minutes to heat water.

Gallons heated through 100° F
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TECHNICAL INFORMATION & SIMPLE FORMULAE
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Water Temperature
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STORAGE HEATING (Heatstore)

Living room or dining room (23°c)

Hall and landing (18-21°c)

Kitchen (21°c)

Bedroom (18-21°c)

Living room or dining room (23°c)

All figures applying to storage and panel heaters are in kW. This information only applies to Heatstore Storage and Panel Heaters and is for a house having cavity walls (not insulated) with NO double glazing to the windows and doors. All rooms are assumed to have average height ceilings of approximately 2.3 metres (7ft 6ins).

If there are any variations from these facts, there could be a slight change to the number and models of heaters required.Should you feel that any further guidance is required,please contact your local CEF branch.

Ambient temperatures as shown.