I know that Opentherm is not really implanted in UK but this forum regroups user from all europe (probably thanks to the very good professionals «animating» this forum).
I have read some good and bad experiences connecting Evohome on a Opentherm boiler, and I'm starting to do some research to replace my old one. Of course I want it connected to Evo through Opentherm with the R8810 gateway!
I learned from (http://otgw.tclcode.com/matrix.cgi#boilers) that the norm only request the OT device to accept a small number of commands, so that some thermostats/boiler combinations will be limited in therm of functionality.
I listed the different message ID numbers that Evohome is able to generate. The one marked with a star are mandatory for the standard (https://www.domotiga.nl/attachments/...ation-v2-2.pdf and http://otgw.tclcode.com/matrix.cgi#thermostats)
Because Evo can generates messages not recognized by some boilers, I suspect I should target a boiler accepting the messages(9,16,19,26,28,56) in order to avoid any problem working with Evo...
0* Master and slave status flags
1* Control set-point (ie Water temp)
3* Slave config flags
5 Application-specific fault flags/fault code
9 Temp Override
14* Maximum relative modulation level setting
16 Room Set-point
17* Relative modulation level
18 CH Water pressure
19 DHW low rate
24 Room temperature
25* Boiler temperature
26 DHW temperature
27 Outside temperature
28 Return water temperature
56 DHW set-point
57 max CH water set-point
63 reserved
128 ?
255 ?
So, here comes my question (!) If you are an Evo/Opentherm user, which boiler do you have, and what are your observations on the temperature regulation? I'm more interested by oil boilers but we could regroup information for gas as well.
Many thanks...
I have read some good and bad experiences connecting Evohome on a Opentherm boiler, and I'm starting to do some research to replace my old one. Of course I want it connected to Evo through Opentherm with the R8810 gateway!
I learned from (http://otgw.tclcode.com/matrix.cgi#boilers) that the norm only request the OT device to accept a small number of commands, so that some thermostats/boiler combinations will be limited in therm of functionality.
I listed the different message ID numbers that Evohome is able to generate. The one marked with a star are mandatory for the standard (https://www.domotiga.nl/attachments/...ation-v2-2.pdf and http://otgw.tclcode.com/matrix.cgi#thermostats)
Because Evo can generates messages not recognized by some boilers, I suspect I should target a boiler accepting the messages(9,16,19,26,28,56) in order to avoid any problem working with Evo...
0* Master and slave status flags
1* Control set-point (ie Water temp)
3* Slave config flags
5 Application-specific fault flags/fault code
9 Temp Override
14* Maximum relative modulation level setting
16 Room Set-point
17* Relative modulation level
18 CH Water pressure
19 DHW low rate
24 Room temperature
25* Boiler temperature
26 DHW temperature
27 Outside temperature
28 Return water temperature
56 DHW set-point
57 max CH water set-point
63 reserved
128 ?
255 ?
So, here comes my question (!) If you are an Evo/Opentherm user, which boiler do you have, and what are your observations on the temperature regulation? I'm more interested by oil boilers but we could regroup information for gas as well.
Many thanks...
Comment