Condensing boilers, some data
Condensing boilers, some data
A condensing boiler is a high efficiency forward-looking boiler that incorporates an additional heat exchanger so that the hot waste air transfer a large proportion of their inherent heat to start to heat the cold water in the boiler. When working at peak efficiency, the water vapour produced in the burning process distils back into water loosing the latent heat of vaporisation.
A fallout results in this water, refered to as condensate, most times acidic, required to be piped outside to a drain or water drain. The boiler will be placed against a wall and the exhaust fumes will travel through the flue. Hot water is served by a little recepticle tank to facilitate quick hot water accessibility.
How can I get the right size of boiler?
In earlier days boiler installers filled larger boilers than were needed. Whilst this ensured that there was little chance of the boiler being unable to supply sufficient hot water, even in the coldest wintertimes, it also meant that they were only employing a part of their heat generation capabilities, and so running under their planned optimum efficiency. If you have installed more loft or cavity wall insulating material since the last boiler was fitted, you will likely find that you will be able to fit a lower capability boiler than before.
Before you purchase a new boiler we recommend you get advice from a CORGI registered fitter.
Do the radiators need to be oversized with a condensing boiler?
The main driver for smaller fuel use from a condensing boiler results from having a larger heat exchanger. Larger radiators would result in cooler return water temperatures, and so result in even better energy performance, but the extra benefit has not been regarded as cost effective, holding in mind that the system is substantially under-loaded for the greater part of the wintertime. That in all likelihood remains true, though the smaller heating requirement for new build may well mean that householders would now endure over-sized radiators more willingly.
The SEDBUK initiative considered these topics, during which it was debated whether condensing boilers demanded to be handled differently from others. The decision was that they need not, and the test results forall the boiler types share the same SEDBUK computation.
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