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Yes, that's what I was alluding to. If the boiler cycles it affects efficiency and also noise as the fan runs slower for heating (80% is heating) and is therefore less intrusive when running. The lower the boiler can drop it's output, the better it matches the property and that changes all the...

A three bedroom semi built in the 30's with solid walls, double glazing throughout, 200mm insulation in the loft and an uninsulated suspended ground floor is likely to have a heating loss of around 8kW at -3°C so your concern with heating is how low can the boiler go not how high. The higher...

All sensors I've sent are 12kohms at reference 20⁰C

And I learned the Viessmanns do the same as other boilers when WC is disconnected. Anyway, you're not cold.

Certainly, and with a pilot the heat exchanger doesn't freeze during a power cut in the coldest weather.

Not positive about Viessmann but with most external sensor software, if there's a problem the heating works without restriction. Just disconnect one wire and if the heating works you'll know it's a boiler not sensor issue.

Don't use Hive apparently, their OT doesn't control DHW temp. I haven't first hand knowledge on this but it was passed to me. EPH are good for OT but I haven't used it with WC, I think the boiler WC takes preference. I use WC and time it for two settings, comfort and setback. Use a simple...

Read the manual, it can often be found in there.

I work for Vokera. I think it's 86% of what we sell are combination boilers so brining in the OT for system boilers wasn't a starter for us although we sell it abroad. DHW on a combi on our boilers has to be from the control, the selector is disabled on our combi boilers, not on all other...

I work for a boiler manufacturer that when tested the evohome did not work with smoothly as the boiler requires an instruction from Evo to adjust DHW temp which it couldn't do however I could answer some other of your questions. Yes, it sends and adjusts flow temp plus also return, DHW , and...

I work for Vokèra as a technical trainer so am partisan however since it and the slightly lower modulating Synergy boiler were launched about a year ago we have people asking to come and see them. Till September warranties are extended as part of a promotion, 12 years on the Pinnacle and 10 on...

He cut the collar because he forgot to put it on and couldn't be bothered the disassemble it I reckon.

If you are looking at a heat pump long term or sooner,with or without grant the Riello NXHM (R32) is tried and trusted or smaller, the Carrier AquaSnap (R290). If you want a hybrid and keep your boiler, no grant at the moment, then either will communicate with the Vokèra Pinnacle or Synergy...

They can but not always, so much depends on the boiler. I ran trials at home on my system and found around a 1% advantage in both together but comfort was smoother with WC alone on a simple timer switching from a comfort temperature to a setback temperature overnight or when we're both out. If...

The heat loss is quite low so you'll want a boiler that can modulate low to avoid as much cycling as possible. Check whether the boiler can be range rated (restrict its maximum heating output) and how low can it modulate that output too. Not all boilers can use WC and OpenTherm together...

I think you were looking at the 35kW Pinnacle, that's fine if you have the cold supply to use 35kW or like water hotter than necessary but otherwise choose a lower output, 25 or 30kW. Don't worry about heating output as you know they modulate lower than almost everything on the market. I'd also...

Oh, I work for them as well as being a fan but I just answer questions, don't try to convince.

Praise indeed, thank you.

All Vokera combi models

If the boiler is going in the same place the delay will nearly always be the same unless you use Smart preheat, not standard preheat. (smart preheat is available in the winter and uses heat when the boiler turns off from radiators to pre-warm the hot water. This is using heat you've already paid...