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I thought I had an even chance of them both working ..conventional system 3 story gaff 30kw wall hung with 28mm flow and return pump 2.5m directly above tried all 3 speeds CentralheatkingMaybe not. There are other factors involved as you no doubt know.
I even tried one flow in to the rads as they were back to back and one return so water had to pass through both
ie no t’s with just one lockshield in and one out.
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As above most likely not. If you go through the checklist we will be able to help you. Plus when you switch it on from cold the feed will be hot how long is it before the return warms up and the boiler modulates ie switches in and out automatically ChkingDo you think/believe connecting 28mm to the 22mm outlets on the boiler will make a difference ???
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