re excessive gas use had bg round and they have done all the tests on boiler its burning correctly , its modulating correctly he says its impossible for the boiler to burn so much gas on the load its working at you couldnt leak that much , he says so getting a meter test - its the only other option so bg says but when i rung my energy supplier to ask for a meter test they were extreamly snotty - even though i have to pay its £75
How old is the meter? Has to be changed by supplier every ten years iirc. I'd write them a letter about it, stating that you're happy to pay the £75 charge but if gas use returns to normal you will expect full refund and will reduce the amount owed over the suspect period by the same %age. It's such an enormous amount of gas for a domestic property, I can't see you'll have much problem?
meter is only 6 months old paid £144 bg call out and told them if meter is proved to be faulty then i expect £144 + £75 back good thing is as soon as they put a new meter in i will know straight away if old one was faulty , as per readings on the new one !
meter is only 6 months old paid £144 bg call out and told them if meter is proved to be faulty then i expect £144 + £75 back good thing is as soon as they put a new meter in i will know straight away if old one was faulty , as per readings on the new one ! <u>If they are wrong they pay.</u> That has always been the case even when the superior Gas Board was running things.
And if you had bothered to do the simply 2min test I ask for at the very start of your 1st thread, it would have answered the question.
its burning correctly , its modulating correctly So can you drop the flow temperature by using the boiler controls alone ??? What was the corgi guys view on this ??.
Potterton confirmed that their is NO CH flow temperature control on this boiler. So it has to be fitted separately.
apparently this type of boiler modulates it self and adjusts the flow temp its self corgi guy says its doing this correctly from potterton book " to suit conventional rad systems the boiler will output a flow temp of 80 deg ,the boiler control will automatically repsond to lower central heating needs by reducing output - thus saving wasteful on-off cycling " its here on page 7 http://www.potterton.co.uk/products/literature/PowermaxHE_InstallationService.pdf thanks so far doitall - whats your verdict then ?
if i turn off ufh and run rads only (all on trvs) or run ufh only or run both together the consumption fo gas is the same ?
apparently this type of boiler modulates it self and adjusts the flow temp its self By modulating the burner down to maintain 80c flow or slightly lower to prevent the overheat stat locking out the boiler as the return temperature rises. Their is NO <u>basic</u> flow control fitted on the control panel to prevent the flow temperaure reaching 80c and the tech guy I spoke to at Potterton confirmed this.
what would you reccomend that i need then ? surely if i run the rads only the trvs will control the temp the boiler has a sensor to check the temp of the flow and return temp of the ch these are working correctly - the corgi guy checked do i just need a room stat connected to the boiler how will this control the ch flow temp i thought these boilers were the best type available at present ? ie ones that modulate
The modulation allows the boiler to control the flame size to ensure the flow temp is maintained at the set point. Traditionally, boilers thermostats had a large hysteresis which means the boiler heats the water to (say) 75*C, switches off the burne, then switches it back on again when the temp is (say) 65*C. Modulation allows a steadier flow temp. What is the model of the boiler?
thanks jimbo the user guide for the boiler is on this page its a pdf file see post further up to r2d2 should the boiler modulate and control the ch temp acording to the load the corgi guy says so he says its impossible to use that amount of gas see page 7 on user guide im off out now till late tonight will be in touch later thanks so far you seem knowledgable on boilers if i turn of ufh and run rads only there are all on trvs the use is the same (gas wise )
im happy for flow temp to be at 80 deg for rads but once at 80deg it should use hardly any gas at all according to corgi boy but once at 80 deg its still doing 1 cu mtr/hour
what would you reccomend that i need then ? surely if i run the rads only the trvs will control the temp the boiler has a sensor to check the temp of the flow and return temp of the ch these are working correctly - the corgi guy checked do i just need a room stat connected to the boiler how will this control the ch flow temp i thought these boilers were the best type available at present ? ie ones that modulate There is no "control interlock" between the zones and the boiler. It needs one, the regs say. You have a primary loop from the boiler. The two UFH zones and a rad zone are taken off. If all TRVs modulate down and UFH on those zones are not calling for heat the boiler is pumping on nothing. You need as a bare minimum an auto by-pass valve between the flow and return pipe at the boiler (is one integral to the boiler?) Fitting a flow switch on the primary loop can switch out the burner/pump. When no flow the boiler is off. When a UFH manifold calls for heat the valve opens and there will be flow in the primary loop. This will activate the flow switch and bring in the boiler/pump circulating around the primary loop. On the rad CH loop have Grundfos Alpha auto speed pump. When the TRVs are down there will be no flow and pump winds down. When the TRVs open there is flow, and the flow switch is switched on and the boiler burner/pump is switched in. Then you can have a timeclock for each zone (two UFH and one rads) No need to switch the boiler as the flow switch does that. The boiler automatically is brought in and out if a zone calls for heat. No call it say out. The boiler modulates the burner to suit the demands on the primary loop. The UFH zones should not get over hot as they have their own controls. However I would have a high limit stat on each UFH zone to cut out the boiler or UFH pump if water over 50 to 55C enters the loop - this protects the plastic pipe. Even so I doubt this is the real reason for the excessive fuel usage. The floor needs to have foam insulation under (enough of it too) and to the sides up the wall to screed level - like a tray. Most don't do the sides of the slab and this is a major cause of flanking heat loss. You may be heating the ground.
thanks water systems yes the boiler has an auto bypass built in the corgi guy said these boilers are most efficent if they are permantly on they will cycle and modulate themselves is that correct, as he was corgi i took it that he was correct this is what i have under floor insulation its 75mm http://www.knaufinsulation.co.uk/output/products/page272.html can anyone explain why if i turn off ufh and run rads only the consumption is still approx 1 cu mtr /hr a;; rads have trvs
sorry forgot to mention dont have that insulation up walls to screed level, have a thinner 10mm that was supplied with the ufh kit
have just turned off the ch and run dhw for 1 hour on its own the water was cold to start with and in 1 hour its used 2cu mtr gas - its a 150l tank does this still sound excessive the input to hw/ch is 7.8w - 25.8 kw
r2d2 my user guide from nu-heat says set boiler to max output and cylinder stat to 55 deg boiler pump on speed 3 and ch pump on speed 3 ive done all this its what i cant understand
21Kw to heat a cylinder is excessive, what temperature did you start and finish with. Repeat again. How much gas in 2mins on full load