Do the radiators need to be oversize with a condensing boiler?
The fundamental reason for this bettered efficiency from a condensing boiler is that it has an oversize heat exchanger. Bigger radiators would result in cooler return water temperatures, and so enable greater energy efficiency, but the additional economies suffer from decreasing returns, bearing in mind that the system is operating at very low capacity for the main heating calendar months. That in all probability remains true, though the smaller heating requirement for new build may well mean that homeowners would now tolerate over-sized radiators more willingly. The SEDBUK project looked at this, and had a look at the recommendations for condensing boilers. The result was that no new recommendations were needed, and the test results forall the boiler types use the same SEDBUK formula. How can I get the right size of boiler? You should keep in mind that previously central heating engineers often put in boilers that had a higher output than strictly necessary.. Although this ensured tha
