At the moment, I’m using a Weheat heat pump to keep a buffer tank warm using a heating curve. However, this doesn’t give me control over switching the heat pump on and off, and the pump also runs regularly just to check the temperature. Would it be possible to use a Fibaro Implant as an on/off thermostat, so I can control the heat pump myself when I detect a low temperature in the tank, or perhaps when the sun is shining adjust the required temperature.
I have a OTGW (Opentherm gateway) between my thermostat and Weheat. I use it to create a heatingcurve. And I can just set the Weheat of by sending a targettemp of 20 C for the water…
And you can read a lot of info with the OTGW…
I did look into the OTGW as well. I looks indeed like a good solution for this. However is have several Fibaro implants near the control unit of the weheat. The Adam thermostat in use is just to start te pump and open some valves, not connected to the heat pump
Fibaro Implants as termostat - If take it exactly, word2word, then answer is NO
Unfortunately Implants does not have internal “wisdom” to switch outputs depending of temperature. And if i remember correctly, there was some limitations also, which input/output combinations Implant can use ( not all at the same time).
Another problem - the Implant can handle quite weak loads on contacts ( that means, You must use The Relay anyway - if Your Pump does not accept some weak pilot signals )
So, You can use Implant as quite mighty termometer (4 different measure points - quite usefull if You have a big Tank to measure from different water levels). But The Intelligence must be exported from Homey ( and actually, i strongly suggest to think about additional safety methods to pervent overheating - may-be Your Pump already havin’ them). And the real actuator some little bit more powerfull relay.
I guess you need something like this:
This connection box is probably what @Cuprum is talking about.
However, this connection box is actually intended for a Shelly Uni / Plus Uni, so I’m not sure if it would also work with a Fibaro Smart Implant. But this connection box contains 2 230 VAC relays with 16 A each and the Shelly Uni / Plus Uni module is powered with 12 VDC. The Fibaro Smart Implant can also be powered with 9-30 VDC. The power supply should therefore be suitable.
I looked further into this and found the Sonoff TH16 Elite + Sonoff Temperatuursensor (THR316D + WTS01
Maybe this is a solution because it has a dry contact.
However there is no sonoff app for homey, so i have to use it in Home Assistant
Just friendly question - checked this thread already? No the Only and One solution there, may-be just some ideas.
PS. If You can choose the physical devices, then why not use some clearly Homey-supported one?
The fact that the sonoff device works on its own when homey or the cloud is down. Or even when a sensor doesnt update is a huge plus.
I don’t know whether i will flash it with tasmota or use it in Home Assistant.
I think using it in Home Assistant is enough for me because there won’t be much to change in the settings when it is working correctly.
But, why do not use something similar?
I have seen the qubino thermostat, however this one doens’t have a dry contact.
Also this one isnt in production anymore.
The keyword is similar 
With less than minute i found this one with dry contact. Not sure, You want/need the display.
This one is perfect, thanks. Haven’t seen this one.
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