Frequently asked questions

We have taken the questions we're asked most frequently at our Call Centre and answered them here for quick and easy reference.

FAQ Categories

All questions (41)

  • What size boiler do I need?

  • How long does it take to fit a boiler?

  • Are there restrictions as to where boilers can be sited?

  • Do boilers require ventilation when installed in a compartment such as a cupboard?

  • What is the maximum equivalent length of a boilers flue?

  • Can 90-degree bends be used on vertical flue systems?

  • Does the system need an automatic by-pass valve?

  • Will turning my water off affect my boiler?

  • How do I adjust the temperature when the water is too hot?

  • Should I turn my boiler off at night?

  • Do Alpha boilers have a pump overrun feature?

  • Do Alpha boilers have built-in frost protection?

  • Can I fill a system with softened water?

  • Do solar power systems work when the sun isn't shining?

  • How often do I need to top up the pressure in my heating system?

  • Why is system cleaning important?

  • How do I prevent or remedy a frozen condensate pipe?

  • How often should I have my boiler serviced?

  • Is my central heating system covered by the boiler's guarantee?

  • What is a condensing boiler?

  • What is a high efficiency boiler?

  • How are high efficiency condensing boilers more efficient than standard efficiency boilers?

  • What is a combination boiler?

  • What is a system boiler?

  • What is a conventional boiler?

  • Do I need a hydrogen-ready boiler?

  • What is carbon monoxide poisoning?

  • How long does a boiler last?

  • How are high efficiency condensing boilers more efficient than standard efficiency boilers?

  • What should I do with my old boiler if I have a new one fitted?

  • I am extending my home - will I need a new boiler for the new section of the house?

  • If I change my old boiler for a new one, how much can I expect to save?

  • Where can I find out about grants for home heating?

  • How much can I save by reducing my heating and water temperatures?

  • How can I save money on my heating bill?

  • What do I do if my radiators are cold?

  • Why has my hot water stopped?

  • What do I do when the 'A' and 'B' lights on the boiler are flashing alternately?

  • What do the lights mean on the front of the boiler?

  • My system comes on during the night or in cold weather when not asked for?

  • My central heating does not work and my boiler is brand new?

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CUSTOMER NOTICE: Please be aware that GasSafe will be taking all services offline from Thursday 25th November until Monday 29th November. During this time, installers will not be able to register installations via our portal.

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