New Condensing boilers, the householders abstract
New Condensing boilers, the householders abstract
A condensing boiler is a efficient modern boiler that integrates an additional heat exchanger in order that the hot waste air transfer a percentage of their inherent heat to pre warm the mains water to be heated. Once working at maximum efficiency, the water steam produced in the combustion action turns revert back into water liberating the latent heat of vaporisation.
A result results in this liquid, called condensate, which is usually acidic, needs to be piped outside to a waste pipe or water drain. The boiler is recommended to be placed on a wall and the output gases will pass through the flue. Hot water is delivered by a small-scale storage tank to help rapid hot water availability.
How can I get the right size of boiler?
It was a past practice to install oversized boilers. Whilst this ensured that there was little chance of the boiler not meeting the heat demand, even in the coldest wintertimes, it also meant that they were not running a full output, and so running below their maximum efficiency. If you have improved the energy efficiency of your property since the present boiler was installed in your house, it is highly likely that you will need a smaller boiler than the current one.
We urge seeking professional advice from a CORGI registered fitter before selecting an appropriate replacement boiler.
Do the radiators need to be oversized with a condensing boiler?
The main driver for lower fuel use from a condensing boiler is that it has an outsized heat exchanger. Larger radiators would result in cooler return water temperatures, and so result in even better energy performance, but the additional savings suffer from falling returns, as you should consider the fact that that the system is is only using a small part of its overall capacity for the bulk of the heating season. That probably remains true, though the reduced heating requirement for new build may well mean that householders would now allow over-sized radiators more willingly.
These effects were studied during the SEDBUK project, during which it was considered whether condensing boilers needed to be processed differently from others. The determination was that they need not, and the test results forthe condensing and the existing boilers use the same SEDBUK equation.