mar0507

Thank you. My previous house, the units were definitely measured in cubic meters. However, I lived there 6 months, so not during really cold weather, and although it did not have a combi boiler, I assumed the shower was from the tank, but maybe it wasn’t. After all the hot water was instantl. I just thought it was because the shower was immediately under the water tank. The house prior to that, i don’t remember, and don’t now have the bills. But again was a Victorian property. the EPC rating of this new build house is B, and apparently the only reason it didn’t get an A was it does not have solar panels. The measurements of the main zone are above, but to repeat are 5.7m x 5.26m. The flooring is tiles . I don’t know about the pipes etc. Pic of ufh system attached. Today the room heated to 19 after about 3 hours (from 16), a bit of sun caused it to get to 29, and only in the last 3 hours has it dropped to 19.

The solfex system we have has a mixer pack, in which the temperature twist was set to 55deg. (I assumed this was a return, but seems more logical to be the temp to put into the ufh). This twist thing has a range form 35 to 65 deg. So if that is true, does this need to be set much lower. What would you suggest? The maker tech team said 55deg was right?

Hi again, I am not sure about the previous houses. but maybe the meters were reading wrong, and it might be the previous houses (except the one i have just left, which i know was cubic meters) was reading gas as cubic feet instead. I have done some reading, around temperatures of condensing combi boilers, and they suggest the dew point is about 54 deg, and therefore the flow temp should be around 65 degrees, allowing for 20deg loss. If this is the case, why should the flow temp be lower than 60deg - as as previously been suggested? what is the best temp of the boiler to control both ufh and rads, and to be able to condese? So during the cold snap should i keep the ufh at 19 (even during the night)? I am sorry i am new to ufh and other people i know who have it say it takes a while to get used to, as it works different to normal rads. During this cold snap, the house drops 3 deg at night (from about 19 to 16 - even before i set the thermostats to the set back temp.) Learning as i go.

Thank you for all your input. firstly, UFH is not as cheap as radiators? Even though every website you go to p, whether ufh or general sites, all say different. with regards to the temperature, the ufh suppliers suggested the boiler at 70 degs would be better, and 55 degs for return, would be good. So what is the better temperature for the boiler and return ( on ufh?). I have rads upstairs so they will need good heat I guess. Therefore will they not take much longer to heat the room? What is a good setting for my boiler for efficiency of cost, as well as for the system? with regard to how much hot water are you using, there are 2 of us in the house, and have 1 shower each a day, and then general washing hands after toilet use etc. The dishwasher and washing machine heat the water as it comes into the machine, so boiler not used. to be very clear, the ufh thermostats are set to 19 degs between 6am and 9pm. Then between 9 pm and 6 am they allow the room to drop to 16 degrees. Again I was told this was better, by the ufh supplier (tech team). in previous houses, with not as good insulation, we had radiators with one thermostat set to 19 degrees during the day, until about 9pm, then off, and back on about 7ish. The most we use was about 1.5 gas meter units per day (even in winter), but now we are up to about 3. These older figures are both for combi boilers and those with water tanks. the house previous to this the meter measured in cubic meters, and was not a combi boiler. Very poor insulation, and still we used less gas than now.

Thank you. To be clear the boiler is a combi boiler. Although the boiler is set to 60 deg, currently running at 54 deg (heating only). The UFH takes roughly 1 hour per degree to heat up. Just so i am clear, the UFH has one turn thing that you can set the temp, and it is at 55 deg (i looks like it is the return - but i am no expert). So in the morning the UFH brings the zones back to 19 deg and will keep it that way until 9pm when i allow it to drop to 16 over night (Solfex, suggested this was good - and all the research i have done suggests best to drop it down a bit over night). So how are the timing short? I have been told by the developer (an individual - not Bovis and the like) that the insulating is very good - although to be fair unsure about the UFH insulation. I will find out. What is best for the UFH insulation? Thanks again

I have recently moved into a well insulated new build, with UFH downstairs and Radiators upstairs. Previously i have been not so well insulated Victorian. I have a Valliant EcoTec Pro 28 combi bolier, and Solfex UFH. I am using roughly double the gas i ever have per day. My Rads are set from 7am to 9pm to about 18 degrees. My UFH is set from 6am to 9pm at 19deg, and then set back to 16 deg. The UFH is set to 2 zones, the living area (all one room - approx 5.7 m x 5.26m) and then the hall and downstairs toilet. My boiler temperature is set to 60 deg for heating and 55 deg form water. The UFH return temp is set to 55 deg. Why am i using so much more gas? Solfex suggested the boiler be at 70 deg (but it made no difference). Your help would be appreciated. I understood UFH was so much cheaper to run. Have i got something set wrong? Could it be that the boiler is programmed wrong or it is plumbed incorrectly.