What is a Heat Only Boiler?

A heat only boiler is a central heating boiler. It provides heat for the radiator circuit.
It can also provide hot water but it needs to be connected to a hot water cylinder.
Compare this with a combination boiler.

A heat only boiler is also called a conventional boiler or a regular boiler.
It is the type of boiler that most people have in their house. The simplest type
is a standard boiler with an open vented type of central heating system. It has a
feed and expansion tank in the loft and heats the hot water using a gravity fed
indirect hot water cylinder. The heating controls are found in the airing cupboard
with the central heating pump. A sealed central heating system can also have a
standard boiler but it needs an expansion vessel and a filling loop.

If the boiler has an internal central heating pump and expansion vessel, it is called
a system boiler. If a new standard boiler or a system boiler is fitted in the UK
by law it must be a condensing boiler because these are more energy efficient.

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