I'm hoping it's the heat exchanger theory - does this sound feasable? I have today injectwed some fernox F4 leak stopper so will see if it makes a difference.
As the boiler is now the age it is I'm going to have to replace soon. Can anyone recommend a condensing combi in the 100 - 120 btu range which has a good record, gives a decent hot water flow, good ecconomy etc. There are so many around I'm not sure how to start narrowing it down.
Finally, the current boiler has a 15mm gas feed. I understand that many of the new boilers of this size require a 22mm feed. Is this correct. Obviously, if I need to run a 22mm feed I will, but it will be a pain due to location so if it is not necessary all the better.
Finally, Finally(!) - ignoring the possible additional gas feed run what would the usual going rate be for a fitter to swap a boiler. It's located in a garage so all pipes etc are accessible and getting a neat finiash isn't essential like it would be in a kitchen etc. What can I expect for someone to do a straight boiler swap for a new model?
Thanks in anticipation...!