New Condensing boilers, the facts
New Condensing boilers, the facts
A condensing boiler is a high efficiency advanced boiler that contains an extra heat exchanger in order that the red-hot waste air transfer a percentage of their heat to start to heat the cold water input. When working at a good efficiency, the water vapour developed in the working process distills back into a liquid freeing the latent heat of vaporisation.
A side effect is that this water, refered to as condensate, which is usually acidic, required to be piped outside to a drain or soakaway. The boiler is required to be fitted to a wall and the waste gases will go through the flue. Hot water is delivered by a modest storage tank to help speedy hot water availability.
What size of boiler should I purchase?
You should keep in mind that in the past central heating engineers oftentimes put in boilers that had a higher yield than strictly necessary.. Whilst this meant that there was never the chance of the boiler not meeting the heat demand, without any concern for icy weather, it also meant that they were principally working at a part load, and so functioning under their configured optimum efficiency. If you have insulated your household since the last boiler was fitted, it could well be that you will be able to fit a lower capability boiler than the current one.
You should ensure you get advice from a CORGI installer before purchasing your next boiler
Do the radiators need to be oversize with a condensing boiler?
The main efficiency benefit from a condensing boiler results from having a bigger heat exchanger. Bigger radiators would allow lower return temperatures, and so enable greater energy efficiency, but the extra economies suffer from falling returns, as you should consider the fact that that the system is working at very low capacity for the bulk of the heating season. Whilst this assertion is correct householders would plausibly accept this in smaller properties.
The SEDBUK initiative looked at this, and had a look at the recommendations for condensing boilers. The result was that no new recommendations were required, and the test results forthe condensing and the existing boilers share the same SEDBUK equation.