Frequently asked questions

What is a Regular Boiler, Conventional or a Heat Only Boiler?

A Regular, Conventional or Heat Only Boiler will heat your central heating system ‘directly’ and produce hot water for use in your home from your cylinder, it heats the water in the cylinder ‘indirectly’ through a coil within. This typical type of system incorporates a boiler, external pump, controls center, diversion valves and water supply tanks. The hot water cylinder and heating are fed by two different cold water storage tanks that are usually located in the loft, the height of these tanks determines the amount of pressure in both your systems.

What is a System boiler?

A System boiler is a Regular, Conventional or Heat Only Boiler, however the pump and part of the controls are incorporated within the boiler itself. It will still heat your central heating system ‘directly’ and produce hot water for use in your home from your cylinder, it heats the water in the cylinder ‘indirectly’ through a coil within. This typical type of system incorporates a boiler with pump, controls center, diversion valves and water supply tanks. The hot water cylinder and heating are fed by two different cold water storage tanks that are usually located in the loft, the height of these tanks determines the amount of pressure in both your systems. Some system boilers can be pressurized directly from the water mains and will not have a supply tank, these will have a pressurized expansion vessel and pressure relief valve too.

What is a Combi boiler?

‘Combi’ is an abbreviation for ‘Combination’. The boiler itself produces heating and hot water for use around the house, all the controls, pumps and diversion valves are incorporated within the boiler and no hot water storage is required. The boiler runs directly off the mains water pressure giving the best possible water pressure out your taps, and therefore does not require any supply tanks. The combi boiler is far more efficient and occupies very little space in comparison to other types of boilers. To change a system over from a conventional type system to a combi system can be a costly exercise but will be recovered in a short time on efficiency.

What is a Condensing boiler?

The exhaust gases from a boiler contain a large amount of latent heat that would normally be released into the atmosphere and lost through the flue. A condensing boiler will condense the water vapour in the exhaust gases and use this latent heat. The boiler will have a condense discharge pipe that will discharge into a drain inside your house (preferred method) or outside. Prevention of freezing in winter of the discharge pipe must be taken if discharging outside. Condensing boilers can be regular, system, or combi boilers. These are the most efficient type of boilers.

How do I get in touch with you?

Please call 07985 224 203, email info@jchildplumbing.co.uk or use our contact form

“J Child Plumbing was an excellent service and very reasonably priced. I would recommend him to everyone.”

Eleanor, SG4, 14 March 2013