Condensing boilers the guidebook
Condensing boilers the guidebook
Combi boilers are commonplace in homes but most people do not know what they are. A condensing boiler is a efficient innovative boiler that incorporates an additional heat exchanger in order that the hot waste air transfers a large proportion of its inherent heat to start to heat the water in the boiler system. Once processing at maximum efficiency, the water vapor created in the working process distills back into a liquid.
A slight side effect is that this liquid, known as condensate, has to be piped outside to a drain or soak away. The boiler should be mounted to a wall and the exhaust fumes will go through the flue. Hot water is delivered by a small-scale storage tank to ensure convenient and rapid hot water accessibility.
What size of Boiler do I need?
In earlier days boiler installers filled larger boilers than were needed. Although this meant that there was little probability of the boiler being unable to furnish sufficient hot water, even in the coldest wintertimes, it also meant that they were principally running at a reduced capacity, and so working under their planned optimal efficiency. If you have fitted additional loft or cavity wall insulating material since the previous boiler was fitted, it could well be that you will be commended to install a smaller boiler than the current one.
We recommend looking for professional advice from a CORGI registered fitter before choosing a suitable substitute boiler.
Do I need to put in oversized radiators with condensing boilers??
The fundamental reason for this amended efficiency from a condensing boiler comes from having a larger heat exchanger. Larger radiators would result in cooler return water temperatures, and so drive efficiency higher still, but the extra benefit has not been regarded as cost effective, as you need to remember that that the system is functioning at very low capacity for the main heating months. That probably remains true, though the reduced heating requirement for new build may well mean that householders would now tolerate over-sized radiators more willingly.
The process we have talked about was integrated in the terms of reference for the SEDBUK project, and evaluated whether there needed to be new conditions for condensing boilers. The recommendation was that no new recommendations were needed, and the test results forthe condensing and the existing boilers use the same SEDBUK formula.