Water Underfloor Heating Forum

Water Underfloor Heating Forum

Water Underfloor Heating Advice Forum.

  • Do people with this type of mixed flow temperature control have any problems with achieving the required manifold flow temperature? The one below I think is similar to the TIO Mixing unit. In the unit below, the hot (boiler) water enters from the bottom left, red arrow, up through the "mixing headwork" which is a […]
  • Similar to radiator dT's, is there a way to mathematically calculate the UFH pipe centres required to satisfy a given room's heat demands? 150mm-250mm centres are banded about online, with no real explanation, obviously smaller centres allow for lower water temps, but there must be a more scientific way on deciding the centres for a […]
  • We have a three zone heating system plus water cylinder (OSO Super S 250L) on an Valliant EcoTec 637. Two CH zones and a UFH zone. Boiler is rarely at maximum power rating, even at full tilt. The UFH zone has it's own pump and the other two zones (three storey house) are just pumped […]
  • I have some strange noises coming from the system, the majority are caused by the flow meters, the clicking noise. But there are other noises, ive managed to capture these on a video, keen to see what everyone thinks..
  • Hi all. I've currently got a system boiler with cylinder and rads on s-plan. I'm planning on installing UFH in my kitchen/diner and utility/downstairs loo. My question is around mixing valves and opentherm. Do mixing valves dynamically adjust the amount of cold being mixed in response to the temperature of the hot? If not, in […]
  • Hi. We have recently bought the ground floor of a Victorian house, about 100 m2. The floors are all laid to very solid floor boards and the ceilings are 3m high. I've had some quotes from a couple of UFH firms, one says they'll lay their product directly onto the exisiting floor boards and the […]
  • Hi, I have a seaside apartment in Azerbaijan, currently a bare core & shell, not even internal walls yet, and am intending to put in wet UFH with ceramic tiles on top. Although we will get someone to do this for us, in my experience here it's always best to have a pretty good idea […]
  • Hello I'm looking at the different pipes for UFH, the prices vary a lot and I'm not sure about the differences between the products. I'm doing two zones, one 127m the other 70m, both will be under screed. JG barrier pipe will cost £400 but Pert-Evoh-Pert is only £170. Both say they are 15mm but […]
  • Hi I have a 4 zone / 7 loop UFH system. 2 zones (4 loops) always get hot when the system is on when the zone thermostats and actuators are off. The video posted shows when I turn on another zones the flow meters drop. (Kitchen prep and kitchen TV are the issue, two at […]
  • Hello, I have a gas boiler in my apartment that heats a net area of 300 m2 with an underfloor heating system. The boiler has a capacity of 45 kW. There's no issue with the heating system, but I want to increase the hot water capacity. I plan to connect an external 200-liter boiler. How […]
  • Two loop UFH system heating 24M2 with lots of glass. Loop lenghts 90M each X 16MM OD piping UFH output 9.52kw. flow/return 55C/34C, dT 21C fowrates, 3.0LPM & 3.5LPM = 6.5LPM total Boiler Vaillant Ecotec plus 438. flow/return 65C/59C due to high recirc rate required to get the boiler away at ignition conditions with UFH […]
  • We have a Daikin Air Source heat pump feeding our hot water and under-floor 8 port manifold heating system. The Daikin has just had its annual service and the engineer commented that the water looked discoloured and that the inhibitor needed replacing?? Is this an easy procedure? I'm pretty savvy at DIY so is it […]
  • I have two adjoining cottages, each with an identical UFH system downstairs. Both been going fine for around five years. But for the last few weeks, one of the systems doesn't seem to be running most of the time. Essentially the UFH does "work", in that I can turn the thermostat right up, and hot […]
  • Hi all, I wanted to ask a general question about an underfloor heating system our plumber is proposing and if this solution will be sufficient to heat the rooms. We have only a woodburning stove (15kW nominal output) that heats our open plan lounge/kitchen/diner directly (6.5kW from the woodburner is given directly to the air, […]
  • bit of an odd one. UFH been working fine for about a year or two now. today the pipes going to it before the zone valve are stone cold. its a very basic system with Hive thermostatic valves controlling the rads upstairs and the zone valve downstairs. Could the pipe be blocked?
  • I have a Neura heat pump and my thermostat has failed (Theben RAM 797 b). I'm looking to replace it with another more modern one I can use with an app etc. My question is, can I replace it with any thermostat or do I require a very specific type thermostat to run the heat […]
  • Hi folks, hoping someone can help with a problem that's been perplexing me since just before Christmas….. I have a wet underfloor heating system installed in 2003 and manufactured by Underfloor Direct in NI – Now out of business. It's one of their triple tube systems and hasn't given me much bother since installation. It […]
  • Hi, I have a 3 storey house built in 1904. We put UFH in the house about 20 years ago. Works well with newish gas boiler. Just curious… I know heat pumps are meant for tightly insulated modern house … but.. Question: Given that my UFH is always at a low temperature – Could I […]
  • I'm attending a wet underfloor heating system, it's an old one ..No flow meters, just adjustable valves on the returns with conventional actuators. Problem is , one loop (far right in photo) isn't heating the floor (timber suspended) . I've bled the loop via a hosepipe, shut off all the other valves/actuators. The flow into […]

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