Might it be a good option to fit a 28mm Spirotrap MB2 on the return next to boiler and an aav next to HW cylinder as suggested in a previous post?
Anyone recommend a good aav unit (some of them look like they need to be soldered on and I'd want one with a compression fitting to make it easier...
Hi, just looking to buy a SpiroCombi myself and have the same issue as this (28mm into boiler). Did you install the 22mm by reducing the pipework afterwards and did it work ok?
Thanks in advance.