.....should the primaries from the boiler go to 28mm? I ask because of a query over a Suprima 50 that runs an average 3 bed semi with a kitchen extension that is now in the process of a loft extension. A HS Megaflo (170 or 210) is going to be fitted and the owner is going to see if the boiler copes before any upgrade decision is made. I may suggest that they upgrade the primaries when the Megaflo goes in to save the floors coming up again later. Presumably the bigger the cylinder the bigger the coil and the bigger the heat transfer. HS's site says to allow the usual 3KW but that doesn't tie in with their coil 'ratings' and 170 and above comes with 28mm fittings. A clue perhaps! Any thoughts guys?
At what output..........
- Thread starter kaboom
- Start date
the boiler wont cope never mind the pipework
the coil in the megaflo
can be rated up to 25 kw
can be rated up to 25 kw
Well that's what confused me. The one's they're looking at presumably will soak up all 15KW from the Suprima from cold. Don't get the 3KW guide bit though. Just a base minimum perhaps? So if the boiler ends up being upgraded- at what KW do the primaries need to go to 28mm?
if they go for another suprima 70'000
give or take a kick in the a**e 
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
