Unlike an immersion heater, a combi boiler heats your water on demand, instead of storing it in a tank. A condensing boiler is any boiler that uses condensing technology to make better use of the heat they
generate from burning fuels such as gas or oil-so a combi boiler can also be a condensing boiler.
The water from combi boilers is heated directly from the mains so the only time the water is released to the atmosphere is when it comes out of the tap. This means that during heating, the calcium bi-carbonate present in the water changes to calcium carbonate and this causes the creation of carbon dioxide which, when close up, is seen as millions of bubbles - this is not sediment, it is merely cosmetic. If you run some hot water into a glass and let it cool, it will slowly clear.
This phenomenon is more apparent in hard water areas and from boiler models with slower and/or lower flow rates.
As with all oil-fired appliances, Grant Condensing Combi Boilers require commissioning at the time of Installation. This simple process ensures that the boiler is working at peak efficiency which, in turn, will result in lower running costs and long-term reliability. Annual maintenance is also made easy by Grant’s cleverly designed front service access to both burner and all the internal serviceable parts. Installation must comply with the current Building Regulations.
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