Wiser Thermostat Kit 3 to control Underfloor Heating and Radiators

[milgo]

Would I be correcting in thinking that with the kit 3 dual zone I could have 1 channel controlling 1 zone comprising of traditional radiators with a room stat and likely additional smart radiator stats and the other channel controlling a single zone wet UFH installation with another room stat?

As the wet underfloor heating would be 1 zone with 2 circuits would there be any need to use actuators on these circuits?

Obviously the zone valve and pump for the underfloor heating would be wired so that a call for heat from room stat would open the valve, start the pump and fire the boiler.

Thanks in advance for any replies.

db

[Alfred_SE · Accepted solution]

Hello,
Thanks for reaching out.

The thermostat kit 3 It is intended to homes with 2 different zones heated with radiators and not for underfloor heating. The Gateway (hub) can control 2 different heating zones motorized valves according each one to the corresponding thermostat.
The hub has 3 outputs, one for each heating zone and one for controlling domestic hot water.

To control a combination of radiators and underfloor heating (UFH), you must combine radiator thermostats with the underfloor heation (UfH) connection strip. The whole can be managed with a HubR controlling the boiler.

Hope this helps!

[Matt22]

@Alfred_SE this is a real shame that you do not support single zone ufh with no actuators on the second heating channel on the hub.

It seems to be a fairly widely used configuration elsewhere that the manifold pump and zone valve supplying the UFH are driven by the switched live from a room stat. With no actuators on the UFH it seems a little excessive to need the wiser UFH controller?

Can you tell us the reasons this is not supported by Wiser? Is it to do with the smart algorithms on a standard heating channel not being able to cope with the thermal lag on UFH systems?

Can this be added as a feature request so that it will be available in the future?

[GLH]

A late reply, but…I have a 3 channel (2x heating + water) wiser hub with one heating channel controlling all radiators (via a 2 port valve, not smart TRV’s) and the other heating channel controlling my single zone Myson UFH. Has worked fine for over a year. UFH has 4 circuits and each has a 24V actuator, all fed from a Myson UFH controller. I found I needed the UFH actuators otherwise the radiator circuit would inadvertently pump through the UFH circuits. If my UFH circuit had its own 2 port valve then that would have removed the need for actuators and Myson controller (essentially just a 24V power supply).