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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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Boiler servicing in detail...

This is what is done, or should be done to service a boiler properly, in detail...

There is a laid down procedure in the manufacturers instruction book for every boiler, but for when the instructions are lost or missing there is a default service procedure set out in the old CORGI 'bible' for gas engineers, "Essential Gas Safety". Here it is, re-written and abridged by me with the jargon removed where possible so you can understand what is (or should be!) being done for your money...

Preliminary examination:
Check with customer whether there are any problems with the system. 
Check the appliance location is suitable for the type of appliance. 
Check the appliance for any damage before starting work on it. 
Check for correct operation of the appliance, including consumer controls and the safety devices. 
Check the flame for correct burning. 
Check the electrical wiring complies with electrical regulations. 
Check for correct clearances from combustible materials. 
Examine gas supply pipework for correct installation and clearances. 
Check for correct ventilation to the room containing the appliance.

Full service procedure:
Remove main burners, clean and inspect for damage. 
Clean and inspect gas injector(s). 
Dismantle and clean pilot assembly and gas injector. 
Reassemble burners and pilot assembly. 
Check condition of ignition leads and electrode. 
Clean the heat exchanger. 
Refit burner assemblies and check seals.
Test disturbed gas joints for leaks. 
Check appliance case and seals (where appliance is room-sealed) for damage and correct assembly. 
Check and adjust pilot flame. 
Check operation of thermocouple (flame supervision device). 
Measure gas pressure and flow rate, and adjust if necessary. 
Inspect/test flue for faults/correct operation. 
Inspect flue terminal for correct location and protection. 
Check system bypass valve (if fitted) is correctly adjusted.
Check sealed system (if fitted) is at correct pressure. 
Advise user to have the system checked at least every twelve months or as specified my manufacturer. 
Advise user of any defects found in writing. 
Apply the Industry Unsafe Situations Procedure if necessary.

Manufacturers' instructions often have many more steps to follow. A proper boiler service takes at least an hour, nearly always more. A gas fire, although appearing to be a more simple appliance, usually takes around the same amount of time because the flue/chimney system needs especially thorough checking.




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