my stats are at 21 deg as recc by nuheat here pics of my manifolds do you mean put the zone valves in the flow just before the manifolds what will this do ? http://i127.photobucket.com/albums/p142/mainmanjohnny/kids003.jpg http://i127.photobucket.com/albums/p142/mainmanjohnny/kids002.jpg sorry can you explain a bit more ? thanks
sorry can you explain a bit more ? I know people that have heating costs averaging £80 weekly during the heating season purchasing oil to fire UF heating . Excessive fuel consumption is nothing new in large properties with UF heating. You can have a system which is reasonably economic to run with the right control system however.
here pics of my manifolds do you mean put the zone valves in the flow just before the manifolds Yes, this is an option but you must also provide another zone valve and time clock for the rad circuit if you want to run the rad circuit separately and to prevent the rad circuit heating up when the downstairs UF heating is on. One zone valve will suffice as your rads and UF heating upstairs have separate actuaters and trvs fitted anyway. Then a separate zone valve for downstairs controlled by its own timeclock.
unfortunatley its not piped up as a seperate circuit its one flow and ret and the rads and ufh spur off it so it comes from boiler then to downstairs ufh then off to 2 upstairs rads - then to upstairs ufh then off to rest of upstairs rads so seperate zoneing will be difficult but if i turn off rads and ufh temp is at 55 deg dont see how it can use so much gas do you ?
i bought my boiler thinking that it would be econimic for heating and water what do you think re the water heating costs for the 1 hour
a friend of mine has ufh and an oil system and he uses £300 of oil per year his is on low and 24hrs per day with no stats or zone valves or what ever he can lower his boiler temp and its at 40 deg - he has no rads
Sure I said this more than once. Turn the blender valve on the manifolds down to 35°c and the boiler down to around 55-60°c and try it for 24 hours, you can always ease it up a tad. £300 a year is ridiculas, double it and you should be happy.
if you turn the blender valve down it goes too cold my boiler is a fully modulating one and does not allow you to adjust ch flow temp
and the boiler down to around 55-60°c Thier is no control on the boiler to do this Doitall. 300 a year is ridiculas Impossible more like , unless he is living in very small property.
what about wiring the setback to the frost stat so the boiler is off overnight unless fired up by the frost stat ?
bg come round and said i should be paying no more than £850 per year ? Are they happy with the meter calibrations ?.
no it was bg that suggested a meter check he said its impossible for the boiler to use that much on the load its working at , not just slightly over but impossible but meter check boys can come until 22 feb bg wrote some figures down- its gas rated at 23.24kw gross and 20.94 kw net it did .072 cu mtr on his 2 min test that was ch only - no dhw so it was doing 51.84 actual in 24 hrs and the absoulte max would be 61.20 do these figures make sense to you ?
so it was doing 51.84 actual in 24 hrs Yes, thats if the boiler runs continually for 24 hours non stop. That being the case then the boiler would be seriously undersized to meet the load.
what about wiring the setback to the frost stat so the boiler is off overnight unless fired up by the frost stat ? Why would you want to do this ? You have a timing programmer which you can time to turn the system off at night. what exactly will that do If you refer to nu heats combination boiler diagrams you will see a two port valve fitted to the radiator circuit. You will also see separate timers controlling the optiflo controllers. <u>This is separate zoning</u> what about the frost stat con - im gonna try that tonight As I said just time the system to turn off. You have this capability I take it ?.
what exactly will that do Prevent the upstairs rad circuit heating when downstairs UF is operating. I would have thought that was obvious. If you get someone competant to wire the system correctly you will have less problems.
Only problem with your calcs water systems is he used 21Kw in an hour to heat the cylinder, the cylinder should have been up to temp in 30 mins. DIA, nothing wrong with the calcs. It says in 1 hour to heat 150 litres 60C is takes x kW and n BTU/hr. and the same for 0.75 hr, etc. Sorry water systems didn't mean your calcs, but the actual total KW to perform the task 21kw I think it was to raise the 150 ltrs 60c. Based on your calcs would you say that was high or about right. To heat 150 litres he measured 21kW input (2 cu metres in one hour, when it should be around half that. It takes 10kW to raise the water 60C in one hour. If the boiler was checked out and it is OK, then the meter is at fault. Did the service man check pressures, etc? Did he do it properly? Sorry, wrong, in a hurry. He has to measure the time the cylidner takes to heat up full, in minutes and the gas used.
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