Combi Boiler Sealed Central Heating System Diagram

The combi boiler doesn t require a bulky storage cylinder and can easily fit into most kitchens or storage cupboards making them the ideal system for houses with limited space.

Combi boiler sealed central heating system diagram.

An automatic bypass valve is fitted inside most combi boilers by the manufacturer these days. Everyone has a basic understanding of how a boiler works. Your combi boiler doubles as a central heating unit by adding a radiator. The vented boiler regular boiler and combination boiler systems probably account for over 95 of water based central heating installations.

So in places where space and hot water requirements are limited such as flats these can be very popular systems. For central heating 2. Hot water is made instantaneously so a hot water cylinder isn t. Whichever fuel the boiler is running on whether it s mains gas oil or lpg it enters a sealed combustion chamber inside the boiler and an electric ignition sets it alight.

Sealed system using a combination boiler the majority of modern combination boilers often include a pump pressure gauge expansion relief valve filling loop and expansion vessel in with the boiler. This helps the installer create a sealed system when installing central heating. How a combi boiler system works. A combi boiler system combines central heating and hot water within the same compact unit.

You should read this page in conjunction with the page on boilers and the page on heating controls. Hamworthy s upton condensing boilers and stratton mk2 wall hung boilers are suitable for installation in sealed heating systems only. Many manufacturers are now stipulating a sealed system to ensure system cleanliness and protect the boilers. System boilers are slowly becoming more common.

Nb not to be confused with vented and unvented hot water tanks which are explained in our guide to hot water cylinders many homes in the uk still have an open vented heating system and in some cases they are the better option for your home. A modern condensing boiler maximises fuel efficiency by extracting heat from the latent waste flue gases by means of a condensing system. Combi is short for combination. Combi boilers are available in gas electricity or oil depending on your fuel preference.

Central heating systems are either open vented or sealed systems. A secondary plate heat exchanger. The diagrams below show three central heating types. A primary heat exchanger.

However our purewell variheat cast iron condensing boiler can be. The boilers fitted to older central heating systems i e. Those over 10 years old have a simple heat exchange system which can be as low as 70 fuel efficient. No external pump no tanks no external expansion vessel no motorised valves and in many cases item 6 is not needed either.

Combination boiler system diagram often referred to as a combi boiler this type of installation heats hot water as you need it without the need for a hot water storage tank.