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It's the ecotec plus 831 combi so no HW cylinder. hot water is fine too, house is warm and only the VRT350f no other VR modules for weather comp etc. VRT350 modulating and just checked d40 was 49, d41 was 40 which I know not the 15 difference but I suspect that difference is when running...

hi thanks for the advice, so downloaded catalogue and got the watts figure per radiator and found towel rail online and comes to 9,495 so 9.5 kwh or 32206 btu which coverts to 9.43 kwh which I'm guessing is if all running flat out per hour. They won't be as TRV valves not on Max settings, so...

Thank you all for your responses, definitely helping, observations this morning, is house nearly at temp in an hour, good, and not used as much gas, also good, but noticed boiler runs S4, but goes past preset 60 ch and then goes into s7 and rad flashing (anti cycling) but not s8.. is this...

Can you tell me does the 350 take the max from the control knob or the d71 setting, as Vaillant tech struggled to answer that. if I turn the knob 60 without changing d71 would the modulating go all way to 75 or stop at 60 - thank you so much for your time ?

Do you know when you start balancing them - youve opened up all lockshields fully and start at first to have it quarter turn, if at that point if had 8 rads, would 2-8 still be open fully, then you move to rad 2 and make that 3 quarter turn, would rads 3-8 still be fully open at that point ?

I got IR Thermostat and its in the drawer, Found the variations on readings pointing at same pipe, 10 to 15 degrees made it impossible to use to balance system, it could read 68 one sec then 55 the next, so trying to go between end of the radiator to balance the lock shield was impossible

hi, can someone explain to me what the D2 setting should be set too, range from 2 to 60. Seen a graph but doesn't help as have a modulating VCF350 controller.

I have noticed it seems to constantly want heat, s4 even when temp is reached. Any help appreciated

Apologies at start for long post but trying to give as much info as possible, Home - detached bungalow build 1989, cavity wall insulation, loft had extra in 2008, doubled glazed, 2 bedroom, 1 bathroom. Size is Width 35 feet, length 32 feet, room height 8ft. 7 Radiators as follows installed...