" but have had the habit of freezing external pipes which stops the heating working....it is generally easily fixed though, as it is external plastic pipe that just fills with frozen condensed water."
Hate to correct you there matey but if your condense pipe freezes then your condense run has not been installed correctly. Upon reaching a run length of 3 metres or as I do as soon as the condense pipe runs to outside increase the pipework to 1 1/4". This significantly reduces frozen pipe risk.
The pipe freezing use to be more of a problem on older condensing boilers when the condensate point used to continually drip but not so much these days as the more modern boilers use syphonic traps to collect the condense in the boiler and then dump the whole traps worth in one go thus reducing freezing risk. Oh and btw there are many routes and ways for the condensate to be routed not just straight to outside. Oh and yes I also consider Worcester and valliant boilers to be one of the best but don't forget those nice little ideal combi logic + boilers. Very well made, easy to install competitively priced 5 years parts and labour guarantee and they are British ( please correct if wrong)
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