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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 and return after 1 hour is 40c - 45c.
Floor area is 50m2 and UFH manifold is 6 zones and 12 loops.
Boiler is set to 65c.
Flow pipe from boiler goes to upstairs radiators (15 and gate valve) and T'd to UFH manifold where on demand pump pushes flow through.
Pump on return brings water back to boiler.
Should I put in 2 port buffer tank and what size or is there a simpler solution?
Wracking my brains to stop short cycling!
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 and return after 1 hour is 40c - 45c.
Floor area is 50m2 and UFH manifold is 6 zones and 12 loops.
Boiler is set to 65c.
Flow pipe from boiler goes to upstairs radiators (15 and gate valve) and T'd to UFH manifold where on demand pump pushes flow through.
Pump on return brings water back to boiler.
Should I put in 2 port buffer tank and what size or is there a simpler solution?
Wracking my brains to stop short cycling!