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needyahelp, the weather comp is doing great for me, I have the boiler set to 20 deg, which adjusts the weather comp curve. On the app I have the heating curve set as follows Slope 1.4, Level 0, which is what the installer recommended for my house. I have attached a graph of house temperature...

Update - installer got back to me and said he'd contacted Viessmann, and they said you have to have one system or the other and not both, as on Open Therm the boiler will be a 'slave' to the room temperature controller. Options were disconnect weather comp, and use Open therm to control the...

Thanks for that. So anyone know if both can be used together, the way my system has been set up, or will Open Therm override the Weather Comp anyway? Weather Comp would be the ideal I think.

Yeah couldn't understand the logic behind all that. I used an independant company called the Heating hub to recommend sizing and type of boiler, and they came back with Viessmann system boiler, not sure why, as I had already told them my hot water usage details, and a recommended installer for...

Yes hopefully, very pleased with my choice at present. good price too.

Hi, It's 10.5 kwh in summer not sure about the tank capacity, it was one of the old standard copper cylinders that went in the airing cupboard, it was fully insulated with the red lagging jacket. Not sure in winter, as heating was on at same time, looked at my usage app, but it doesn't...

Wonder if you can advise at all, I've had a Viessmann 050 25kw combi boiler with Weather Comp installed to replace my old hot water tank system. The installer has fitted an EPH CP4 RF thermostat and receiver connected to Open Therm, and says that they work together to control the flow...

Here's an update for anyone interested. I had a Viessmann 050 25kw combi with weather compensation, and an EPH controller connected Open Therm fitted by a local company, glad I went with them, good communication and got the job done. Original installer never got back to me with a quote after I...

Hi Razor900 Wonder if you can advise at all, I've had a Viessmann 050 25kw combi boiler with Weather Comp installed to replace my old hot water tank system. The installer has fitted an EPH CP4 RF thermostat and receiver connected to Open Therm, and says that they work together to control the...

Certainly does, thanks very much for that, looks an easy solution.

Thanks, I have seen that, just not so sure what should happen to the orange wire. Trying to figure out the wiring so it is priority DHW.

Hi, thanks for reply, not sure what WC is - wiring connector? My wiring is as follows, not sure I understand quite what you mean - connect white and grey together and connect to HW OFF? HW OFF is connected to the grey (240v when off, 0v when on), CH ON (240v when on, open cct when off) is...

I'm looking for a method of converting a three port mid position valve to a 3 port divertor (2 position) valve by changing the wiring connections. I've been told it can be done, but can't find anything that says how. Anyone help please? Thanks.

I think they do, but I will check with the plumber first.

Got this back today, after I asked Veissmann about the boiler I wanted to use. I will see what the plumber says too. Your Installer will need to wire the Y plan valve so there is no mid position (Hot Water priority) and you can then add the Weather Compensation accessory ZK07124 Weather...

I will update after I speak to the plumber to arrange another visit. Basically you just control everything on an app, or via the room stat, so no physical controller, uses a Hub and Receiver instead.

Did a bit of digging, as I understand it, you can control the boiler via Veissman app, so no need for an external controller. App details say you can control all functions, HW and CH timing remotely using wireless technology. I have a Hive system now, but not sure if that can be integrated into...

On your last paragraph, I was thinking the same, I can time the HW to come on before CH, we don't normally have the, CH on all the time anyway, but reading about WC, it seems it works more efficiently if you do. Can always experiment with it anyway. One thing I am very clear on now is I...

Thanks for the reply. Hmm.....not sure I understand about not timing the hot water, I only have it on now for an hour in the morning, and half hour mid afternoon. That is more than adequate for our needs, or am I missing your point somehow, our cylinder is the old copper type with a new jacket...

Found this here just for info: https://hhic.org.uk/uploads/5A5F2F2C7D545.pdf Points to note Depending on appliance design, when weather compensation is fitted to a combi boiler the radiator temperature may not be able to be controlled with the boiler thermostat in the conventional fashion, as...