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Thanks for all of the replies.
Builder has agreed to replace the 5m stretch in 22mm copper with push-fit joints which I'm happy with. This is after a conversation with the heating engineer!
Looking at 13 rads of various sizes over 3 floors - mostly horribly old ones. That's existing, plus about 50m² of new UFH. Heating engineer thinks that a Vaillant ecoTec Plus 637 is sufficient for that based on a walk around the house and review of the UFH plans.
He's also proposed a Super Oso 250L for the cylinder.
Not entirely sure what he is proposing pump wise. Would more than the pump in the boiler be required do you think?
Builder has agreed to replace the 5m stretch in 22mm copper with push-fit joints which I'm happy with. This is after a conversation with the heating engineer!
how many rads do you have totally ish?
also sounds like you need to size the pump correctly to pump the water up 3 floors etc
Looking at 13 rads of various sizes over 3 floors - mostly horribly old ones. That's existing, plus about 50m² of new UFH. Heating engineer thinks that a Vaillant ecoTec Plus 637 is sufficient for that based on a walk around the house and review of the UFH plans.
He's also proposed a Super Oso 250L for the cylinder.
Not entirely sure what he is proposing pump wise. Would more than the pump in the boiler be required do you think?