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Boiler types
New boiler?

New boiler cost?

Condensing boilers
Combi boilers
Boilers in which I specialise
Older boilers - worth fixing?
Boiler servicing
Expected life of a boiler
The boiler temp control

What is "SEDBUK"?

Boiler descaling
The Powerflushing MYTH

Asbestos risk in boilers

Concealed flue duct risk
Boiler Reviews


Central heating:

How does it work?
Pipework layouts
Open-vented or sealed?
Thermostatic valves
Warm air heating

Unusual boilers:
PulsaCoil, BoilerMate
  & other thermal stores
Electric 'flow boilers'

Range & Potterton PowerMax

Ideal iStor
GEC Nightstor


Hot water:
Four types of HW system




Avoiding the rogues
Plumbers not turning up
Building Regulations
Common faults
Dangerous appliances
Mains hot water
DIY gas work
The Gas Regulations
Plumber or Heating Engineer?
Boilers in lofts




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Four types of hot water system...

There are more than four ways of providing hot water, but these are the most common:

1) Open-vented hot water cylinder
2) Combi boiler
3) Mains pressure unvented hot water cylinder
4) Thermal store


I'll expand on these shortly.... This page will eventually replace the Mains hot water page in the 'Miscellaneous' box.

Open-vented Hot Water Cylinder:
This is the most common. It is the ordinary dome-topped copper hot water cylinder most houses have in the airing cupboard. A simple store of hot water that can be heated by a central heating boiler or an electric immersion heater. When both are installed, the immersion heater is a useful backup method of obtaining hot water if/when the central heating boiler has a fault or breakdown.

Combi boiler:
A central heating boiler with a complex internal arrangement that allows it to directly heat the domestic tap water as it flows through the boiler. Primary advantages are low installation cost and no space required for a hot water cylinder. Numerous drawbacks though. Combis discussed in detail here.

Mains pressure unvented hot water cylinder:
These run at mains pressure instead of being fed from a tank in the loft. The hot taps run as fast as the cold mains taps! Showers work brilliantly and baths fill quickly. They are expensive, need to be installed by a specialist with the correct qualifications, and can go wrong if not serviced regularly. Just like everything else really.

Thermal store:
An initial page on thermal stores here.




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