The Efficient Home Forum

Evohome does not support this application

You'll need an evohome controller for each boiler

What you've done is fine. The guided configuration allows a variety of different system configurations glad you have found one that suits your needs.

The boiler flow temp limit should be set to suit hot water recovery, depends on what cylinder you have really?

Hot water overrun gives the boiler a 'soft landing' when the cylinder is recharged. You may be able to reduce the DHW set point a few degrees.

Pump to comfort keep the pump running at low demand making use of the residual heat in the flow and meaning that when the combustion does kick in at low load it runs for longer

When there is absolutely no heat demand the pump switches off

Yes just latch open and rebind accordingly

You can simply bind another evohome to the OT bridge.

Sounds like the boiler is modulating so nothing fundamental wrong but I would bin the heating zone valve and this will let the boiler pump the water round the primary even when there's low load heat demand. The low load operation is a very interesting area and it's best to let the OpenTherm run free ...

Hi You're mixing control strategies here. Evohome does not offer a full integration for priority hot water so I'm not sure what you hope to gain by having an S Plan configuration with an OT bridge. However it is possible to configure this, you'll need to take the feed from C on the DHW BDR to A on ...

Here is a great fact sheet that explains OpenTherm is the name given to a form of communication of information between modulating (condensing) central heating appliances and room thermostats. It sets the rules as to how the appliance and room thermostat communicate with each other... http://www ...

This IS possible but requires careful planning in particular how the heating is piped and valved. Any specific systems that you have in mind please provide sketches and advise can be given based on experience and practical application. OpenTherm integration does vary in different boilers ...