Ordinarily I know the correct thing to do is to get a registered Corgi plumber in to quote for the whole of the central heating system and to supply and fit a boiler within that price. This is what I have done and whilst I can get another more competitive quote the first proposal was too high.
Subsequently I approached a friend of ours who is currently on a plumbing course if he would like to do the work at the house (apart from the bit connecting to the gas supply of course). He is up for this as it is difficult to practice when you are training and getting a house to do from top to bottom is excellent experience. Whilst he is comfortable with every aspect of laying the pipes etc he is not sure about how to calculate what size boiler is required and nor am I.
I have scoured the web for sites that help to calculate it but have not been very successful. After a lot of messing around I think I need a 24Kw Combination Condensing Boiler for a house with 6 radiators, one shower, one bath and three sinks. It will be well insulated with double glazing (the house that is not the boiler!).
I have no idea if this is appropriate and will need to continue my research.
Obviously our friend will be checking with his tutors on his course but I prefer to try and understand these things rather than just taking people’s word for it. It would be an expensive error if we bought the wrong one.
