Hi need to replace the mothers ageing boiler.
Not sure if its a system boiler that i need. She doesnt want to get rid of the HW tank, There is a three port valve currently there.
I know its not a combi, could tell me what sort is needed/
thanks
darren
system boiler. That has a pump inside as well. Ideal.
If you already have an external pump etc isn't fitting a system boiler likely to be extra work for no reason?
Assuming that it's a vented system and that you're not proposing to convert it to a sealed system, you just need a 'conventional' boiler - i.e. just the boiler, no pump, no expansion vessel. You *don't* need a combi. However, in order to comply with the current building regs, it will need to be a condensing boiler unless you can demonstrate compelling reasons why that would not be practical. It needs to have access to an outside wall for the condensate drain - so it may need to be in a different location from the existing boiler.
The controls will also need to comply with current regs - so you'll need to make sure it has a boiler interlock (which it probably already does if it's a conventional Y-Plan or W-Plan system) and you'll have to fit TRVs on all but one radiator if the rads don't already have them.
Thanks to everyone for the help.
Darren
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