System Types

Conventional Boiler System

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A conventional boiler works on the basis of a stored source of hot water characterised by a boiler, hot water cylinder, cold water storage tank and external pump. The system will also have either a header tank (open vented) or an expansion vessel (sealed).

The system may be fully controlled allowing for heating and hot water separate to each other or partially controlled allowing for hot water or heating and hot water together.


  • Multiple tap operation
  • Typically quicker hot water
  • Drying benefits of an airing cupboard
  • Immersion heater back up


  • Heating up a tank of water you may not use
  • Takes up space to house the tanks
  • You may run out of hot water

Combination (Combi) Boiler System

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A combi boiler works on the basis of instantaneous or on demand hot water characterised by a boiler only and a plumbing configuration that allows the boiler to produce hot water as you require.


  • Only heat the water you need and never run out of hot water
  • Space saving, no tanks and a dry loft
  • Marginal improved energy efficiency


  • Most combis are a ‘one tap operation’
  • No immersion back up
  • Dependant on mains pressure

It’s important that the correct decision is made but you don’t have to make that on your own.

A central heating boiler is an important investment. Our in home expert will adopt a consultative approach, covering all bases so you know the system we recommend is the right system for you and your family, now and in the future.

We run through all aspects of the work confirming all potential disruption so you have a clear path forward and no nasty surprises.

Call The Boiler Exchange on 0141 354 8885 or complete our contact form today.