Find the best gas boiler thermostat zWave

warp · Post by **warp** » Monday 02 May 2016 16:07

I am looking for a gas boiler thermostat zWave

I wish a thermostat that stores no data on a website (I did not want that one knows when I go on holiday)
I hope it's still a nice look example (which unfortunately is not yet marketed in France)

: 5472c171f2a27.jpg (82.63 KiB) Viewed 3688 times

gizmocuz · Post by **gizmocuz** » Monday 02 May 2016 16:31

how about a opentherm gateway supported thermostat ? (with for example a honeywell thermostat)
working like a charm, and no online storage

warp · Post by **warp** » Tuesday 03 May 2016 13:34

Thank you for your response gizmozcuz, I have found that Wifi modules at "Honeywell thermostat" no Zwave? Normal?

gizmocuz · Post by **gizmocuz** » Tuesday 03 May 2016 18:34

Correct, i also meant, why zwave ? Why not use an opentherm gateway (with an opentherm compatible thermostat like the honeywell)?

Marci · Post by **Marci** » Thursday 05 May 2016 19:06

Am using cheapy eBay £2 433mhz transmitter to run a Siemens RDH10RF/SET - fully self-contained... all logging/graphing handled by Domoticz - lots of options really.

RidingTheFlow · Post by **RidingTheFlow** » Friday 06 May 2016 23:06

I had a Secure/Horstmann Z-wave thermostat and thought it was pretty good.
Now I wrote a python PID/PWM control script for Pi, £2 temperature sensor and £2 relay, tuned it to my house - and this doing better job at keeping temperature +-0.1 degree which this £80 z-wave thermostat can only dream of. Now I am going to sell it, wish I didn't buy a Z-stick specifically for it.

pierrotori · Post by **pierrotori** » Tuesday 15 May 2018 0:13

Marci wrote: ↑Thursday 05 May 2016 19:06 Am using cheapy eBay £2 433mhz transmitter to run a Siemens RDH10RF/SET - fully self-contained... all logging/graphing handled by Domoticz - lots of options really.

Hi Marci,
i have a RDH10RF and wich protocol you use to add the device ?
Pierrotori

nigels0 · Post by **nigels0** » Sunday 30 December 2018 12:08

Yes, am interested too

Marci · Post by **Marci** » Friday 02 August 2019 23:06

Sorry - been a while since I logged in here and just spotted the notification, but better late than never.

Refer to http://rossharper.net/2015/11/decoding- ... pberry-pi/ and https://github.com/PatchworkBoy/boilercontrol

The code probably won’t work for you out of the box - you have to make a 433mhz receiver first to record (as audio) your thermostat’s pulses to work out the bits and timings etc, which are unique to each thermostat / receiver pair, and update the code accordingly before compiling. But by all means, compile and try it - if it does work then (1) it’s a fluke and (2) siemens didn’t use unique pulses / timings, they must select from a pool.

This process is documented in the first link - I’d never done anything like it before so everything I know about the process was gotten entirely from there, and I’ve used the same process since to sniff out other cheap 433mhz devices off eBay that aren’t detected / supported by my TRXrfx433.

But... once done ...you end up with a pair of bash commands to run. 'callforheat 1' to turn heating on. 'callforheat 0' to turn heating off - alias those to heaton and heatoff commands, then call those as on / off commands of a virtual switch. Build a virtual thermostat for the virtual switch using LUA & temp sensors (& occupancy sensors etc if you want to go that far).

This setup has been running my heating for 3 years or so in combination with Homebridge without any issues.

silence00 · Post by **silence00** » Thursday 29 August 2019 15:21

In reality you have many options if you're willing to put the effort in. You could use a Z-Wave boiler relay and thermostat for example, though a better bet would be to also use controllable TRV's. I once spent ages writing control routines for multi-zone heating using Z-Wave TRV's, thermostats and a boiler relay ( plus detecting when the things inevitably stopped working for some reason. ) Not a cheap way to go though.

In the end I just got a Honeywell EvoHome system, which works well with Domoticz and for me has paid for itself in a couple of years... but YMMV. It takes care of all the "detecting a window open stuff" and is much better than Hive and the like because it allows you to set schedules for individual rooms. Not even sure why Hive is "a thing" if I'm honest - it's just a remote controlled thermostat. You can still only set the temperature of the whole house at once.

EvoHome isn't cheap, but for me it's been brilliant, and saves hours of messing about trying to do something bespoke.

pierrotori · Post by **pierrotori** » Tuesday 05 October 2021 22:16

@marcy do you have schema with the raspberry and the system on gpio ?
@silence00 what is the reference of the Honeywell EvoHome ?

do you develop a script lua or dzvent to manage the on and off for the boiler ?

pierrotori · Post by **pierrotori** » Monday 07 March 2022 16:27

@marcy @silence00, any news ?