Home Button

Prices Button

Services Offered Button

About Us Button

Contact Us Button

Where We Are Button

Domestic Electrical Button

Commercial Electrical Button

Search This Site Button

Site Map Button

Central Heating Boilers

This web page contains information about central heating boilers.


This web page first describes the purpose of central heating boilers then gives a short description of combination, condensing, sealed system and back boilers.


Purpose Of Central Heating Boilers

The purpose of a central heating boiler is to provide the heat the central heating needs to:

  • Heat the radiators of a property .
  • Heat the hot water.

The requirements of the central heating system decide the ‘size’ of the boiler; the ‘size’ of the boiler is the boiler’s heating capacity.

The bigger the property the higher the boiler’s heating capacity should be.


Central Heating Boiler Problems


Combination Boilers

Combination boilers combine the water for the central heating system with the hot water for the taps into one heating system, therefore the name ‘combination’ boilers.


Combination boilers (‘combi’ boilers) take cold water from the water mains and heat it. Combination boilers do not need a water tank so are cheaper to install than other types of boiler.

A combination boiler provides unlimited hot water as it heats the water ‘on demand’. Combination boilers are efficient so are cheap to run.

Disadvantages of combination boilers are they are more liable to break down and the flow of hot water can vary when a tap is turned on in another part of the property.

Condensing Boilers

Condensing boilers are the most expensive type of boiler to buy and install.

Condensing boilers are the most efficient type of boiler; they cost less to run than other types of boiler.

Given the high cost of energy a condensing boiler will probably save money in the long run.

Condensing boilers remove the heat from the gas products of combustion and use it to heat the water. Boilers normally vent the gas from combustion out of the flue. Removing the heat from the gasses causes the water vapour to condense, therefore the name ‘condensing boiler’.


Sealed System Boilers

Sealed system boilers are part of a central heating system that has no direct connections to any other part of your property – they are ‘sealed’.

Most boilers either feed, or are fed by, a water system. Sealed system boilers are as the name suggests – sealed – they do not directly connect to anything.

Sealed system boilers heat the water for taps and radiators indirectly.

Sealed system boilers can use either water or oil.

Sealed system boilers are generally more reliable than combination or condensing boilers but the hot water, for radiators and taps, is not instant.


Back Boilers

Back boilers fit behind a fire therefore the name ‘back’ boiler; they are at the back of a fire.

Back boilers come from the times when many houses had coal fires; the heat from the coal fire heated the water in the boiler.

When replacing coal fires it was easy to fit, say, a boiler with a gas fire on the front, as the space was already there.

Back boilers are reliable but are expensive to install and run.


Judge Electrical Limited
15 Mulberry Court, Huntington, York, YO32 9TU
Telephone 01904 764845 (Landline), 07919 033113 Mobile)
Email info@judgeelectrical.co.uk
VAT No. 852917405. Company Number 6359328