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Looking for some help! I am having problems with my underfloor heating only getting lukewarm, even when on for 8-12hrs constantly (see pictures) . It is currently costing £25 to £30 a day and using 150 to 200kw a day to not even be warm and is driving me crazy. I am struggling to get above 16 degrees in some rooms but others i have got up to 19 degrees. I have had heat in the system before. As set out in the background below I have had a Heatmiser system installed and currently having a plumber coming back to try to solve the issue. Any suggestions? Some background I moved into a property just over a year ago. I have underfloor heating in all rooms with one radiator downstairs and one towel rail upstairs. The existing underfloor heating Manifold was upside down and thermostats didnt work very well. Before Christmas last year I had the manifold corrected and a Heatmiser system installed. The system seemed to work although I was spending quite a lot during the winter months. I found that I had less than 100mm of insulation in the loft and assumed that was where I was losing lots of heat. The rest of the property is pretty well insulated, with double glazed windows and doors, insulated cavity walls and now topped up insulation. The system (see picture - system off in picture) 10 port manifold Heatmiser UH8-RF 8 zone Heatmiser Neoair v2 wireless 8 actulators but 9 systems Grundfos pump 2 radiators All rooms underfloor Heatmiser plug boosters - ordered additional ones. Neohub Gen2 Floor is engineered oak through out I have had the boiler at varying temperatures from 60 to 75 degrees Mixing valve - set at 55 degrees Specific problems One of the flowmeters seems stuck - Ordered new one Occasional knocking and clicking sounds Heatmiser thermostats keep going off line Heating switching on during the night Heatmiser thermostats jumping between auto, hold, standby Advised by Heatmiser not to use direct I have borrowed a thermal imaging camera and can see the loops heating up although in most places there is no heat in the floor. Most rooms downstairs have plenty of loops whilst upstairs some rooms are limited. It seems that the system is getting up to a temperature but not full temperature. I would appreciate any advice to get the system to heat up to previous heating levels. Or do I need to install electric radiators??? Mark

This weekends fun & games was adding more loft insulation, we went from 100mm to 450mm and it was a pain to do with very little working space. The cold snap has prompted me to do this. The digital thermometer (positioned upstairs) in the house has been varying between ~ 5 to 10deg over the last month or so, this is around 1 or 2 degrees more than the thermostat on the Wunda ufh manifold suggests (downstairs).. The house does not have any heating - thats due to come in January. Today (with the loft hatch open - for the insulation) with 2 oil filled rads + a fan heater running (~ 5kw in total) the temp rose upstairs to 7deg (started at ~ 6) and up to 8 after an hour with the loft hatch shut but this is obviously air temp. I measured the slap temps at between 4 & 5deg. The ufh pipe in 70mm below surface, on top of 225mm of celotex on top of a b&b floor. With up to minus 10 predicted around here for tomorrow night - how concerned do I need to be about the ufh freezing? I am planning on leaving the oil filled rads on overnight (3kw). Not too sure I can do a lot else. With the temps then predicted to rise hopefully ther wont be any damage. Right to worry or not?