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Wow - that’s very kind of you to take the time to help. I need to go through it all. I shall respond! (Ps the 60 degree blender was a test, as I said we have only tiled ufh ATM so I wasn’t concerned about warping wooden floors etc. I usually have it set at about 45) thanks again

Update: Forgot to add. I now have the boiler working pretty well with no cycling. Changes are (some to try and fix cycling, some just as part of house renovation): I added a new UFH circuit to the manifold (I’m adding as we complete rooms in our house) I tuned down the max output power of...

Thanks. The new boiler will def be sized to the new system. I’ve found some sizing tools online. Money etc means not possible right now. Trying to make the best I can in this cold weather. In the summer I think I can retire this one. Just one thing I still don’t understand: do you know what...

That sounds ideal. but my boiler I don’t think has that functionality. I do have it plumbed so that the water gets priority when called for. The tank reheats in <15mins

yes, I have an auto bypass. Fiddled with it trying to find some optimum setting. Didn’t know about white tape. I had always read black tape was better. Thanks I have tried lowering the boiler temp, because ufh requires a lower temp than the rads I had before. Didn’t make any difference As...

Looking for help/tips from an expert who knows how to diagnose/suggest tips to get the most out of my boiler. Greenstar 40CDi conventional. I have mostly ufh now in all rooms, though some circuits are not yet connected. I have a sealed HWC attached too (not a system, just sealed) when the...