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Sure, @chrisk801. I based my setup on a diagram in these forums but can't locate it at present, so I've sketched out what I have, which is much as you describe: The relay is off when HW is off, thus connecting the boiler OpenTherm contacts to the OpenTherm output of the downstairs CH prog stat...

I am encouraged to hear that my room stats would still work if weather compensation is fitted, but I guess the question is whether adding a weather compensation kit would disable the OpenTherm control from the EPH stats. Here's the page from the EPH user guide for setting OpenTherm parameters...

Thanks both for your further thoughts. It is mysterious about SL2 and whether this is Frost Stat or not. @Notch7 - the reference to Frost Stat is on page 26 of the installation manual you linked (zoom in on the left small circle) and on page 28 on the Primary PCB. But I note the caution from...

Thanks @Notch7 , @MNW67 and @Mister Banks , but I really don't think weather compensation is going to solve the problem of requiring two different target flow temperatures because the weather compensation bit has no info about whether the boiler is providing HW or CH. @Notch7 said previously...

There does not appear to be any mention of OpenTherm or PDHW on their website, so I don't see how your comment is relevant to my original post - please could you explain where OpenTherm and PDHW come into your recommendation?

Thanks again for your thoughts, appreciated. Yes, Vogue and Logic Max Heat 2 seem different. In summary, the Logic Max Heat 2 offers terminals: SL1 (primary on/off from room stat), SL2 (Frost Stat), OpenTherm and Weather Compensation. Useful link, thanks, and it shows that the weather...

Thanks for your reply. Yes, there is an SL2 on the boiler, but no information is given about this in the installation manual and it is labelled as Frost Stat Optional. So on this model it doesn't appear to be a switched live for HW. I tried asking Ideal what it does, but they would not reply to me.

Thanks for your reply - yes, it's as the setup you showed, but with two CH zones (an additional CP4) and yes, I've been in contact with EPH tech support. You are correct that P06 seems to offer DHW temperature control, but this doesn't actually affect the temperature that the CP4 sends to the...

I've recently had a new Ideal boiler installed (Ideal Logic Max Heat 2 H18) and plumbed for PDHW (priority hot water). I use it with EPH CP4 series: CP4i, additional Combipack 4, CP4-HW-OT, wired and configured as per EPH instructions, covering downstairs, upstairs and hot water tank, with the...