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Many thanks D Hailsham for the tip about the Boiler size calculator. You are correct - we are not enlarging the house. When I put our figures into the calculator it gives us a required figure of 20kW. Thanks also to all the other contributors on this thread. From ScottishGasMan's input it would...

Update: I just received the installers reasoning (now that he's back from holiday): "The gas boiler we have chosen for this quote is a Vaillant Ecotec plus 428, the reason for this is because of any extra radiators or underfloor heating to be added to the house, also this boiler can be...

The installer has yet to come up with any reasons behind his spec. It's becoming more & more apparent that he doesn't really have much of an idea. We are more than slightly concerned about his ability to marry the new set up to the underfloor heating successfully.

I have been recommended to look at Main as an alternative manufacturer to consider with a good warranty for about £150. Any thoughts?

I would love to keep the old Baxi because it just soldiers on with regular servicing. Unfortunately the wall that it sits on will be going in the refurb and the heating engineer told us that we can't move it to a new location under current regulations.

It is an obsolete Baxi Solo 2 60 PF which appears to have an output of 17.6kW

Thank you for your replies - looks like I need to ask a few more questions as to why he spec'd the boiler that he did. Did the 6 series suffer from the cycling problem or is the cycling more a function of choosing the wrong capacity of boiler in the first place? Thanks again for your help & advice

I don't know - he looked at the size of the house, the number of radiators, number of bathrooms etc and came up with this boiler as the one for us. We would like water based underfloor heating in the kitchen/diner and downstairs bathroom if we can do it so maybe that has a bearing on the boiler...

We are about to embark on a refurb of a 1930's brick and tile detached 4 bed house. The kitchen is being moved and the wall where the 20 yr old boiler is sited will be going. We currently have an open system and the heating engineer is suggesting a pressurised system (250l unvented hot water...