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can anyone tell me how long it takes for the adaptive curve to settle down. Started curve on 1.7 and adaptive yes and curve keeps going back down, yesterday went from 1.6 down to 1.3 and then today it’s 1.2 but then finding it struggling to get lounge upto 21c, gets to 20c then struggles...

Should the 831 boiler know it’s got the vrc700 connected, it is via ebus and 3 and 4 closed but according to boiler manual d47 is Outdoor temp (with weather compensating vaillant controller only) should show actual degrees outside, yet vrc700 showing 7 degrees, d47 reads 999 ? Just wondering if...

Thank you for all your help and advice. As said trying to get this setup right, isn’t easy, hoped installer knew it, but unfortunately didn’t, in fact told me didn’t rate wc units at all and at moment it’s been using more gas per day than before having it, I appreciate weather too and hopefully...

Thank you think be better at Lowe then, do you leave auto on though, or turn that off and say set to 1.5 and see how it goes, do you agree with the vaillant guy just trying to get d40/41 15 difference, he basically said it was always on as the system small so water returning too hot. Asked me...

Thanks very much for your quick replies, that makes sense, it’s lowered to 1.7 and still overshooting at moment, room getting to 21.5 when called to be 20.5, although this better than first day when curve had been left on 1.2 and it never got to 20.5 . Guess it’s the fine tuning now, when I...

Can I ask do you know why it has a none setting and that’s default from factory, I would have thought it would only have the two settings temp mod or thermostat if they the ones to always use.. think that’s what’s confusing me.. vaillant also said curve normally 2.1 to 2.8 but it’s actually...

Hi, Can some one please explain the difference in plain english as struggling with manual for Activating Room Temp Mod. None Temp mod Thermostat Temp mod Installer said if set on thermostat its not a true weather compensator just an expensive thermostat, although I have set on thermostat...

Spoke to vaillant tech support, they got technical engineer to call me back, 45 mins on phone, he went through various settings on the boiler to ensure got 15 difference between d40 and D41 before modulation, had to read some figures in various settings, he worked out deltaT and flow rate and...

Well I hope these weather compensation units learn quick, as this so far way more expensive than a load modulation. 55kwh of gas and only 12pm :(

Mine are all 25 year old too, so now you both got me thinking should be 2.3 but I set it at 2.0 and it’s automatically come down to 1.8

Actually ignore that as I set to 2.0 and adaptive curve I just checked as altered it to 1.8, leaving alone now for it to set over next few days and see what happens, max temp set to 70 and d0 increased to 12 to give some leighway in my figures making 10 max. Room has heated to 21 now when it...

Read that vaillant recommend 2.3 in the uk for the heating curve

Thanks ScottishGasMan, much appreciated. Set heat curve 1.7 now, setback and thermostat. Hopefully with those settings will start to see improvement in comfort levels and usage. Thanks rbranco too

Thanks guys, should it be set as thermostat too

Hi ended up with vrc700f as they didn’t stock the newer 720f and offered it me at 55.00 with returning the 350f. Couple of questions as installer wasn’t sure how to set it up as he hadn’t come across one before, Set heating curve to adaptive. Set room temp mod to thermostat ( it’s in the...

Well what a week, thanks to you guys Id got the gas down a third, staying in the 50 not 75kwh a day, and then yesterday afternoon noticed it staying on and the receiver for the 350f in front of boiler grren light gone out, spoke to Vaillant as only got in Dec and told it's died and needs...

Scottishgasman Take into account that a 10kw heat loss on a boiler with a heat exchanger and pump designed for 30kw is rarely going to manage a 20 degree flow and return difference. If you strangle the radiators to get 20 degrees then your also dropping the heat output of the radiators so in...

Cheers thanks for the quick reply, so its either 470f if find stock cheap, 700f or vsmart then

Do you know if can add a weather compensation to the VRT350F with the boiler or would have to look at replacing the lot. Think issue is VRC700F costs £210.00 so expect would take years to make that outlay back.

looking at the Stelrad catalogue the elite series I got designed to run at 75/65 so setting d71 at 60 might be too low. I think d0 - 10 but d71 - 65 probably better even though the 350 modulates that down anyway.