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  1. G

    Initial fill of UFH circuits

    HI, we have replaced 3 manifolds (1 upstairs 2 downstairs) with new Warmup units. The installation manual from Warmup states that to fill the system you have to fill each circuit in turn using the fill / drain points on each manifold. However, my plumber said that he always uses the filling loop...
  2. L

    UFH + heat pump - is it connected correctly?

    Hi, we had UFH installed dowstairs in our house recently, and I'm not 100% sure that it's connected correctly. I'd be grateful if someone could have a look at the diagrams and tell me if what the plumber did makes sense. The house is heated with an A2W Samsung/Joule heatpump. The buffer...
  3. R

    UFH loss pressure 0 when off

    Just recently installed UFH .When all radiators and Ufh are on pressure normal floors are warm radiates are warm .When anything is turned off pressure drops to 0 with Worcester boiler flashing I have isloated it to the UFH and not boiler or radiatets could this be anything other than a leak...
  4. A

    UFH and natural stone resin

    Hi, does anyone have any advice on fitting a natural stone resin bath and shower trays over wet UFH. I have been advised that the bath could be in danger or cracking if the UFH runs above 35 degrees but this is probably not going to be the temperature needed to keep the house warm as it is the...
  5. H

    Wet UFH: low profile vs screeded

    What are the disadvantages of low profile wet UFH boards, in comparison to conventional pipe-in-screed systems (those in which there is at least 50 mm of screed)? Would these disadvantages be as relevant in a small bathroom (wet room) application, for which the total floor area is less than 10 m2?
  6. D

    Is it possible to 'repair' a Hep2O (Wavin) UFH flow control?

    After balancing the flows, one of these blighters has started to drip very slowly from under the red cap. It feels loose to turn, so I suspect the seal around the spindle is to blame. It won't be 'worn' as such, as they don't get fiddled with for years, but this tiny adjustment was seemingly...
  7. J

    Very high water consumption

    Hi everyone, I moved into a new build three bedroom, two bathroom bungalow about 2.5 years ago. Ever since we moved in there has been an issue with the water pressure. Toward the end of last year the pressure had got worse. For instance, you could not run another tap in the house if a...
  8. J

    UFH and Rad Pipework Layout From Combi.

    Hello I'm new to the forum and wanted to ask a question after having a good read. House is undergoing a complete renovation and new pipework needs to be installed for the heating system. The current boiler is a WB Greenstar 34CDI combi boiler and is not very old so I wanted to reuse this in a...
  9. J

    Wet/electric ufh and radiator manifolds) in Southeast London

    As part of deep house renovation, planning to install wet ufh on the ground floor, and radiators on upper floor. Two bathrooms will have both water based towel warmers and electric ufh, and need dual thermostat to separately control air temp (by running towel warmer) and floor temp. Need...
  10. J

    UFH vs radiators manifolds

    I am doing heavy house renovation and want to have ufh (multizone) at the ground floor and radiators on upper floors. I want to have consistent controls, with manifolds feeding both the ufh loops and radiators, and the same type thermostats controlling both (depending on the room, the...
  11. ArifP569

    Pressure loss when UFH called for

    Hello all, hoping someone could help me with this, Boiler pressure is 1.5 bar, but when we turn on UFH pressure drops to 1 bar. then when we turn off UFH, pressure on boiler goes back up to 1.5 bar?? any help much appreciated
  12. S

    How to replace UFH return pin valve

    Hello, I have UFH set up with a HIU in my flat. My issue is that one zone (Bedroom 2) does not heat up. All other zones working and heating as expected. Have checked the relevant thermostat, as well as the electrical actuator for the specific zone. Both look ok Checked return pin valve -...
  13. J

    UFH Thermostatic Mixing Valves

    Are there fundamental differences in some of these TMVs?. The attached one, below, would seem to be the better type where a shuttle moves to balance the hot&cold flows, as it increases one flow it decreases the other to keep the mixed flow constant, necessary say in showers etc. I have seen...
  14. C

    Can't find UFH manifold vent/drain valve

    Hi all, I can't locate the vent/drain valve on this manifold. My manifold resembles the "UFH Manifold RUB-RT1tm4" model on this webpage: https://www.thermo-floor.co.uk/underfloor-heating-manifolds.html I an intending to replace on the the actuator pin-valves and I think I need to drain (or at...
  15. Z

    UFH pump robbing from Rad system

    Hi We have an UFH system part of the house (large kitchen / dinnner and utility room) and then Rad system for rest of house (10 rads). We have noticed in this recent cold weather when both UFH and Rad are on (ie thermostatic driven) the UFH is robbing all the hot water and not getting round...
  16. T

    Advice on low-profile UFH system in ex-council flat.

    Hello all. First time posting so apologies if this is answered elsewhere. I am close to completing a purchase of my first flat, an ex-council place from the 1960s built in the usual concrete slab and brick. At present there is some ghastly pipe work for the radiators sprawling round every...
  17. A

    UFH mixing valve bypassing hot water directly to cold return

    I have a UFH manifold from Wundatrade with a Grundfos pump. The pump feed has a mixing valve which has a hot inlet from the thermal store, and a cold inlet from the return manifold. In-between the mixing valve cold inlet and the return manifold, is a tee which returns the cold water to the...
  18. R

    Nottingham/Newark G3 Plumber/Heating Engineer Required

    Is anyone local available to help survey my current unvented heating set up including underfloor heating? Thank you 😊
  19. R

    Undersized System Boiler???

    So I posted a while back regarding my 300ltr unvented cylinder not seeming to keep any volume of water hot for very long. Could it be the system boiler is not powerful enough? I have approx 220m2 of underfloor heating and the hot water cylinder’s . Does anyone know if Worcester Bosch Greenstar...
  20. R

    CH and UFH performance problem

    Hi all, I have recently had a UFH circuit added to my existing CH/HW system and had a question on performance when UFH and CH are operating at the same time. My boiler is an Vailliant EcoTec Plus 630 and for a number of years this was running with a CH and HW loop only. Each loop had a 2 port...
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