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5
INSTALLATION
3. HEATING CIRCUIT
All water heating installations should be designed, before product installation, and installed by
a competent heating engineer in conjunction with the requirements detailed in the following:
The Building Regulations
The Local Water Authority Bylaws
IEE Wiring Regulations
BS 5449: 1
Any other relevant Local Authority Regulations
BS 5449: 1 gives detailed recommendations of water circulation systems.
This manual gives only give basic advice about system design. The full system should be
designed with regard to individual requirements of the installation.
Sizing Radiators
The size of radiator required for a room depends the following factors.
a) The temperature that you want it to be able to maintain, the table below is a guide:
Ideal Room Temperatures: -
Lounge 21 C
Dining Room 21 C
Kitchen 16 C
Bedrooms 15 C
Bathroom 23 C
Stairs 18 C
b) The heat loss from the room.
The calculations for this depend upon the size of room, number of windows, numbers of
doors and, the construction materials used in the building. Too big and the system will
overshoot its temperature and be less economical to run, too small and it won't reach its
desired temperature. The calculation produces a heat loss figure in watts, of how much heat
you need to warm that room up to the design temperature. The calculation can be done by
using the radiator manufacturer's heat loss calculators, and should be completed by a qualified
heating engineer
.