S
snodge
I have a new-build property with underfloor heating on four floors. The boiler is in the basement, and the height between the basement circulator and the top floor manifold is around 6.5m. I estimate the total potential flow of the UFH system at 75 litres / minute based on the settings of the various flow gauges on the UFH manifolds (it's a big house). The supply loop from the boiler to the manifolds is 25mm. The problem I have is that under high demand (around 50 litres / minute - I don't heat some of the rooms) I can't get the heat to the upper two floors until the lower floors are satisfied and some zones shutdown. Example on recent testing being 45 degrees basement manifold, 45 ground floor, 40 first floor, 35 second floor.
The circulator that has been fitted by the builder's plumber is a Selectric 15-60 130, running at speed 3. I've checked the specs of this circulator - am I right in thinking it is woefully under-specified to meet peak demand?
The manifolds have their own circulators, Selectric 15-50 130, running at speed 1. Changing the speed of these doesn't make any difference to the problem.
I have suggested to the builder that something like the Magna 25-100 would be more suitable to cope with full demand and provide the necessary head. Am I heading in the right direcction with this suggestion, or is it over specified?
Any advice would be appreciated so that I can point the builder in the right direction of what needs doing to sort it.
The circulator that has been fitted by the builder's plumber is a Selectric 15-60 130, running at speed 3. I've checked the specs of this circulator - am I right in thinking it is woefully under-specified to meet peak demand?
The manifolds have their own circulators, Selectric 15-50 130, running at speed 1. Changing the speed of these doesn't make any difference to the problem.
I have suggested to the builder that something like the Magna 25-100 would be more suitable to cope with full demand and provide the necessary head. Am I heading in the right direcction with this suggestion, or is it over specified?
Any advice would be appreciated so that I can point the builder in the right direction of what needs doing to sort it.