Opork
Standard Member
- Joined
- Nov 20, 2019
- Messages
- 6
- Reaction score
- 3
- Points
- 26
- Age
- 68
- Location
- Newcastle, Northern Ireland
Having read forum entries, particularly from Deezell and Navdra, I’m still not sure if this is possible. Could anyone advise/comment on my situation.
I have underfloor heating downstairs and radiators upstairs. I also have a hot water storage tank upstairs. The timings associated with the firing of the boiler are managed by a three channel controller (Horstmann ChannelPlus H37xl).
I have installed tado smart thermostats (replacing my old Honeywell wired thermostats) in each room downstairs, set the 'downstairs' channel on my Horstmann controller to permanently on and this works well based on the schedules I have created in the tado app.
I have installed tado smart radiator thermostats upstairs on all the radiators. Again these work well with the schedules I have created in the tado app - HOWEVER - upon setting the 'upstairs' channel on my Horstmann controller to permanently on, in anticipation of the tado radiator thermostats managing the call for heating, the 'heating' actuator for the upstairs area immediately opens and starts the pump next to the boiler. This actuator remains open and the pump continues to circulate water from the boiler to the radiators irrespective of whether or not any of the tado radiator thermostats are calling for heat or not. While this 'theoretically' works, in that the radiators will only actually heat up according to the schedules I have created in the tado app, the heating pump remain permanently on. For example, during the night when I have set the tado radiator thermostats very low (13), the pump keeps on pumping all night.
It had been my intention to continue to control my hot water needs using the third channel on my Horstmann controller, however I have now also purchased a tado Extension Kit and would like to install this in the hope that I can configure it such that the heating pump only comes on when the radiators are actually calling for heat, while it also controls my hot water demands.
Tado have indicated they do not have instructions to replace a three channel controller with an Extension Kit (as the Extension Kit is effectively a smart two channel controller) and have suggested I contact a local electrician to change the wiring.
I am hoping that in replacing my existing three channel Horstmann controller with the tado Extension Kit, I will be able to effectively 'short circuit' my existing channel 1 (which is the downstairs underfloor heating), which should continue working as it does now with the hardwired tado smart thermostats controlling the underfloor heating. And then rewire the Channel 2 and Channel 3 of the existing Horstmann controller (which are upstairs radiators and hot water respectively) to be Channel 1 and Channel 2 on the back plate of the tado Extension Kit.
Logic suggests this should work – i.e. it should enable my downstairs underfloor heating to continue to be controlled by the hardwired tado smart thermostats, while allowing me to control my upstairs radiators, via the tado radiator thermostats and Channel 1 of the tado Extension Kit, (without the upstairs actuator and central heating pump being permanently on), and simultaneously have my hot water controlled by Channel 2 of the tado Extension Kit.
Any thoughts/comments appreciated.
I have underfloor heating downstairs and radiators upstairs. I also have a hot water storage tank upstairs. The timings associated with the firing of the boiler are managed by a three channel controller (Horstmann ChannelPlus H37xl).
I have installed tado smart thermostats (replacing my old Honeywell wired thermostats) in each room downstairs, set the 'downstairs' channel on my Horstmann controller to permanently on and this works well based on the schedules I have created in the tado app.
I have installed tado smart radiator thermostats upstairs on all the radiators. Again these work well with the schedules I have created in the tado app - HOWEVER - upon setting the 'upstairs' channel on my Horstmann controller to permanently on, in anticipation of the tado radiator thermostats managing the call for heating, the 'heating' actuator for the upstairs area immediately opens and starts the pump next to the boiler. This actuator remains open and the pump continues to circulate water from the boiler to the radiators irrespective of whether or not any of the tado radiator thermostats are calling for heat or not. While this 'theoretically' works, in that the radiators will only actually heat up according to the schedules I have created in the tado app, the heating pump remain permanently on. For example, during the night when I have set the tado radiator thermostats very low (13), the pump keeps on pumping all night.
It had been my intention to continue to control my hot water needs using the third channel on my Horstmann controller, however I have now also purchased a tado Extension Kit and would like to install this in the hope that I can configure it such that the heating pump only comes on when the radiators are actually calling for heat, while it also controls my hot water demands.
Tado have indicated they do not have instructions to replace a three channel controller with an Extension Kit (as the Extension Kit is effectively a smart two channel controller) and have suggested I contact a local electrician to change the wiring.
I am hoping that in replacing my existing three channel Horstmann controller with the tado Extension Kit, I will be able to effectively 'short circuit' my existing channel 1 (which is the downstairs underfloor heating), which should continue working as it does now with the hardwired tado smart thermostats controlling the underfloor heating. And then rewire the Channel 2 and Channel 3 of the existing Horstmann controller (which are upstairs radiators and hot water respectively) to be Channel 1 and Channel 2 on the back plate of the tado Extension Kit.
Logic suggests this should work – i.e. it should enable my downstairs underfloor heating to continue to be controlled by the hardwired tado smart thermostats, while allowing me to control my upstairs radiators, via the tado radiator thermostats and Channel 1 of the tado Extension Kit, (without the upstairs actuator and central heating pump being permanently on), and simultaneously have my hot water controlled by Channel 2 of the tado Extension Kit.
Any thoughts/comments appreciated.