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UFH has been on for 3 hours. On time for ufh is 1 min on and 4 mins 14 secs off! Could it be sludge? Manifold shows 50c flow and 44c return.

It's bewildering why no short cycling with bigger Warmflow boiler compared to now! I'll ask engineer to check ufh re flow in case of sludge but he did put something in system when he installed the Vortex. If engineer and Grant eventually recommend a buffer is 50L OK?

I spoke with Grant and advice is to reduce nozzle size from 1.25 to 1.00 which reduces btu's from 140000 to 122000. They said boiler is too big but there's 15 upstairs radiators to satisfy!! The boiler is new from April this year and was sized by heating engineer!! If smaller nozzle has little...

Thanks for your reply. I'm not technically aware but in response I think the Grant Vortex is 36kwh whilst redundant Warmflow was 52kwh at least. Somehow the Warmflow didnt short cycle but was that because it held more water? The UFH flow is mixed down to 40c returning out at 38c when up to heat...

In the summer I replaced a massive Warmflow Bluebird 200 oil boiler holding 50L with a Grant Vortex 36-46 holding 21L. As its colder I have now switched UFH on but boiler short cycles every minute once up to heat. There was no short cycling with the Warmflow boiler. The UFH is set to 45c flow...