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What I also noticed is that if you make any adjustments to any zone’s schedule, warm weather saver is deactivated for all active zones.

Thanks for the insight @ally153, that explains what I am seeing.

What determines when warm weather saver is activated for a zone? I don’t think the outside temperature ever exceeded their set...

I think the motivation is less user intervention. Warm Weather Saver will save energy if a user doesn’t normally turn off the heating or switch to eco mode in spring/autumn. It probably avoids...

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Some interesting observations.

As reported previously, the outside temperature is 3C less than actual.

I have both Cold Weather Boost and Warm Weather Saver activating at the same...

Maybe you will need to use Signal2 BDR91Ts to signal to the HCE80s to switch to cooling mode.

The installer was indicating a cable needed to run from the zone valve to control the boiler.

What you describe doesn’t require a cable back to the boiler, I think just wiring the high limit stat...

Yes, that’s correct

If you have a boiler control BDR91 you don’t need the Zone valve to fire the boiler.

If you need to switch the boiler to a DHW mode for instance by connecting a cylinder NTC, you can use another...

The plumber is wrong, Evohome can wirelessly activate more than one BDR91 relay on DHW operation.

Was your System Summary in the System Configuration menu showing 0%?

There can be a delay before 0% is indicated and until then there may still be a call for heat.

Yes, this should work and would at least limit CH overshoot on DHW heating

The boiler DHW operation is completely independent from Evohome, Evohome doesn’t provide the time. The Eco learning is supposed to be based on usage, so I guess it’s essential that the boiler’s time...

I’d always recommend using OpenTherm if you can, sounds like your installer is not familiar with its benefits.

I’d vote for Intergas too, I fitted one in my last house. Or an Atag.

I’ve inherited a Vokera in my new house. Out of the box it would default to 80C max flow temperature, so I’ve used an OTGW...

Sounds like this is DHW preheat, have you tried setting it to Eco?

► P-on (Program on):
The appliance's DHW comfort function is switched on continuously within the chosen time slots. In this mode...

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Here are all the types of requests seen by my OTGW. You can see there are a bunch of them with a period of around 1m45s.

The DHW ones are odd, because Evohome doesn't distinguish...

Great. Might be useful to understand typical electricity consumption/costs too.

Bruce, how often does the Evohome controller communicate with the OTB? Maybe that frequency has changed and that influences how often the OTB reads boiler parameters. There are several other...

From my previous house with Intergas boiler. The Intergas boiler returns fractional temperatures, its sensor was very accurate according to my Netatmo weather station.

01:42:24.375260 T001B0000 ...

Yes, that's right, approximately every 1m 45s. It's not OTGW initiated, it is coming from the OTB (T for Thermostat, B for Boiler):

00:01:06.465029 T001B0000 Read-Data Outside temperature:...

It's worked well for me in both a radiator and now a UFH setup. I can hardly believe that the previous owner of my house had the UFH TMV set to 75C with a boiler temperature of 70C. Now, in this...

Out of interest Vaughn, what is your setup? I see myself eventually going down the GSHP route. My house was originally going to have one fitted but the previous owner heard negative feedback from...

Stick an OTGW between the OTB and VR33? That should tell you whether the Domoticz->HGI80->OTB path is working, returning the same value.

We know OTB->Boiler->Outdoor sensor works. The OTB...

Yes, this initially confused me as well. A 10C request is used by Evohome to signify off, but by default, if CH Enable is on, it will be interpreted by my boiler just like any other request below...

Heat Pumps are supported by the latest firmware and new BDR91T