Page 505 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 7 Central heating systems

Theoretical Underfloor Radiator heating Warm air
ideal heating heating on inside wall heating
2.7m

Eye level
1.7 m

16º 20º 24º 16º 20º 24º 16º 20º 24º 16º 20º 24º
p Figure 7.60 Heating theory
Hot water cylinder

Pump Two-way manifold
Pump

4
3 5
2 6
1 7
Top view

Boiler
Underfloor heating circuits

p Figure 7.61 Typical underfloor heating system combined with wet radiators

The higher the TOG rating, the less heat will get through. Floor coverings used
with underfloor heating should have a TOG rating of less than 1 and must never
exceed 2.5.
Quite often, underfloor heating is used in conjunction with traditional wet
radiators, especially in properties such as barn conversions. The higher
temperatures required for radiators do not present a problem because the
flow water for the underfloor system is blended with the return water via

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