Equipment details

While shopping for Opentherm equipment with home automation in mind, it can be useful to have some idea to which extent boilers and thermostats support the opentherm protocol. Only some messages are mandatory (ID's 0, 1, 3, 14, 17, and 25), all others may or may not implemented. (Yes Daalderop, support for MsgID 14 is mandatory.)

For home automation it is important to buy a thermostat that supports MsgID 9 (Remote override room setpoint) and possibly MsgID 100 (Remote override function). It may also be nice to get a boiler that supports MsgID 18 (CH water pressure).

Unfortunately this type of information is not usually provided by the manufacturors. That's why I started compiling a matrix with information extracted from logs of the opentherm communication between thermostats and boilers provided to me by Opentherm Gateway owners.

Of course, the fact that equipment returns a value for a certain MsgID doesn't always mean it really supports it. For example, I have heard that the Intergas boiler may respond to MsgID 18 (CH water pressure) with a value of 6. Clearly that is totally bogus. The valid range of values is only 0 to 5. 6 bar would definitely not be good for a central heating system.

Another example: the Remeha iSense sends MsgID's 20, 21 and 22 with its current time and date information, but it ignores whatever values it gets back in the response, unlike the Honeywell chronotherm IV. As a result, the Opentherm Gateway is not able to change the clock on an iSense thermostat.

For the reasons mentioned above, I obviously cannot give any guarantees on the information provided below. It's a best effort attempt to provide some more details on Opentherm equipment than are readily available from other sources. However, I can not be held responsible if information in these tables turns out to be less than accurate.

If your equipment is missing from the tables below, please add it by uploading an otmonitor log file.

Clarification of the tables

  • A bullet (●) next to a DataID in the thermostats table means the thermostat has been observed to send the specified DataID.
  • A bullet (●) next to a DataID in the boilers table means the boiler responded with a Read-Ack or Write-Ack message to a request from the thermostat for the corresponding DataID.
  • A cross (×) means the boiler responded with an Unknown-DataID message to a request from the thermostat for the corresponding DataID.
  • A question mark (?) indicates that logs have been uploaded with conflicting results for the DataID.
  • If there are very few bullets listed for a boiler, that does not necessarily mean that the boiler has very limited Opentherm support. If there are also very few crosses, the boiler was probably used with a thermostat that doesn't send many different Opentherm DataID's. Only a large number of crosses indicates poor Opentherm support by the boiler.

Boilers

 
AGPO Econpact 127C
Agpo Ferroli Econpact 225c
Atag A244EC
ATAG E325EC
Atag i-Serie
AWB ThermoMaster 2HR
Baxi luna 3 Confort HT
Baxi Main Four 240 F
Baxi Nuvola 3 Comfort
Baxi Nuvola DuoTec HT 24
BAXI Prime 1.24
Baxi Slim
Bosch GAZ6000
Bosch HRC 30
bosch HRC35/2
Brink Allure B25 HR
Brötje WGB 2
Bulex FAS
Daalderop Combifort
Daalderop Comfort Classic 130
Elco Thision 9
Elco Thision 25
Elco Thision XL
Ferroli BlueHelix Pro
Ferroli BlueHelix Tech RRT 28C
Ferroli BlueSense 5
Ferroli Megadens
Geminox THRi 5-25 DC
Geminox THRi 2-17 DC
Geminox ZEM 2-17C
Hajdu HGK-28
Hitachi RWM-2.0FSN3E
Hoval TopGas Comfort 16KW
Ideal Combi Logic 24
Ideal Vogue C32
Intergas Kombi Kompakt HR
Intergas Kombi Kompakt HR (36/30)
Intergas Kombi Kompakt HRE A 28/24
Intergas Kombi Kompakt HReco
Intergas Kompakt Solo HRE
Intergas Prestige CW6
Intergas Xtreme 36
Itho Daalderop Base Cube
Itho Daalderop WPU4
Itho Kli-Max 2 CW6
Nefit Proline NXT HRC 24/CW4
Nefit Smartline (HR) + EMS-OT
Nefit TopLine Aquapower + EMS-OT
Nefit TopLine Aquapower HRC 45/CW6 + EMS-OT
Nefit TopLine Compact HRC25 + EMS-OT
Remeha
Remeha Avanta
Remeha Calenta
Remeha Quinta 28c
Remeha Quinta 35c
Remeha Quinta 45
Remeha Quinta Pro
Remeha Tzerra
Remeha Tzerra Plus
Remeha W28 Eco
Techneco Elga (+ Remeha Calenta)
Termet Ecocondens 30 1F (WKJ1301000000)
Unical KONm
Vaillant EcoTEC CW5+
Vaillant hrSolide C
Vaillant hrSolide VHR NL 24-28C/3 C
Vaillant VHR NL 24-28C
Viessmann Vitodens 050-W
Viessmann Vitodens 100-W
Viessmann Vitovent 300
Windhager BWE 100 Exklusiv Bj2006
0  
1? 
2×××    ×      ×  ×××     ? ×      ××  
3×      ××         
4                  ×                ×                                  
5                     ××××     
6     ××      ×××          
7                                   ×                                 
8         ×                     ×                                  
9 ××××× × ×    ×× ××    ×          × ?×× × ×  × ××××    ×× × ×× ×  
10  ××        ×× ×              × ××     ×      ×               
11                                  ×              ×      ×            
12  ××         ××               ×  ×     ×      ×         ×         
13                                ×                                   
14 ?×      ××  ××?×××××     ×
15 ×           ×            ××    ×        ×××         ×× ?  
16××× ×× ××× × × ×??×× ×  ×  ××× ×? × ×
17?    ××××?× ×
18      ×      × ×   × ×    ×  ××  × ×
19   ×      ××    ×   ××× ×××   ×××         ×× ××× ×      ××     ×  
20 ×  ×   ×  ×            ×    × ×             ××   ××          ×  
21 ×         ×            ×    × ×              ×   ×××         ×  
22 ×         ×            ×    × ×              ×   ×××         ×  
23         ××    ×        ××    ×                                   
24××× ×× ×××××××× ?×?×× ××××××× ×? × ×
25   
26   ×   ??      ×   ×   
27××      ××   ×         ×     ×  × ××   
28       ××× ?××    ×  ×××× ×
29××        ×    × × ××     ××××    × ×           × ×××   ×      ×× ×  
30           ×    ×            ××    ×                                   
31     ×   ××             ××    ×                                 
32          ××                 ×    ×                                   
33         ×                 ×              ×           ×        
34                              ×                    ×                   
35                            ×     ×              ×                  
36                              ×     ×             ×         ×        
37                              ×                                        
38                              ×                                        
39                              ×                                        
40                              ×                                        
41                              ×                                        
42                              ×                                        
43                              ×                                        
44                              ×                                        
45                              ×                                        
46                              ×                                        
47                              ×                                        
48    ××     ×        ×      
49              ×?×        ×       
50                  ×          ×    ×                                   
51                              ×                                        
52                              ×                                        
53                              ×                                        
54                              ×                                        
55                              ×                                        
56    ?× ??     ×  ×   
57×    ××× ×??××××××××    ×
58                                  ×                                   
59                                                                      
63                      ×                  ×                         ×  
70              ×                    ×                 ×                
71              ×                    ×                                  
72              ×         ×          ×                                  
74  ×           ××                   ×  ×                               
77                                                                      
78              ×                    ×                                   
79              ×                    ×                                   
80                                                                      
82                                                                      
85         ×                                                            
86  ×           ××                   ×  ×                                
87  ×           ××                   ×  ×                                
88  ×           ××                   ×  ×                                
89                                                                      
90  ×           ××                   ×  ×                                
98     ×                           ×                                    
99 ×       ×                           ×              ×           ×× ×  
100 ××××    ×    ×× ×                 ×      × ×    ×××     ×× × ×× ×  
109 ×                                   ×           ×  ×   ××       ×× ×  
110 ×                                   ×           ×  ×   ××       ×× ×  
111 ×                                   ×           ×  ×   ××       ×× ×  
112 ×                                   ×           ×  ×   ××       ×× ×  
113                                          ×                         
114                                                                    
115    ×                         ×              ×       ×     ×  
116 ××  × ××       ×         × ×   ×    ×  ×× ?  
117  ×   × ××             ×         ×      ×      × ×           ×  
118  ×   × ××             ×         ×      ×      × ×           ×  
119 ××   × ××       ×           ×××    ×   ×    ×  ×× ×  
120 ×  × ××       ×         × ×   ×    ×  ×× ?  
121 ×   × ××                   ×      ×      × ×           ×  
122 ×   × ××                   ×             × ×           ×  
123 ××  × ××       ×             ?       × ×    ×  ×× ×  
124 ××  ×        ×× ×                × ××     ×      ××   ××             
125  × ×         ××                × ××                         
126×× ×   ×  ××××    ×     ××××  ×    × ×××× ××   ×       × 
127×××     ××××       ×××××××× ×         ×     × 
128          ×                ×                    ×                 ×
129        ×                                                    
130          ×            ×                                        ×
131                                                 ×                ×
132                                                  ×                ×
133                                                  ×                ×
134                                                                     ×
135                                                                     ×
136                                                                     
140                                                                      
141                                                                      
142                                                                      
151                      ×                                                
152                                                                      
153                                                                     
154                                                                     
155                                                                     
156                                                                      
157                                                                      
158                                                                      
159                                                                      
170                  ×                                                   
171                                                                      
172                                                                      
201                                                   ×                   
202                                                   ×                   
203                                                   ×                   
206                                     ×                                 
207                                     ×                                 
208                                     ×                                 
210                                     ×                                 
211                                     ×                                 
212                                     ×                                 
213                                     ×                                 
215                                     ×                                 
218                                     ×                                 
219                                     ×                                 
220                                                                      
221                                     ×                                 
223                                     ×                                 
224                                     ×                                 
225                                     ×                                 
230                                     ×                                 
255                      ×                  ×         ×                  

Thermostats

 
AgpoTherm Plus Artikelnummer: 1201045
ATAG Wize
Baxi 7104336
Baxi luna 3 Confort HT
Baxi Nuvola 3 integrated
Baxi uSense
Bosch OR80
Bosch TF30
CENVAX VAG 5000 floor
De Dietrich AD289 iSense
Elco Remocon Smart
Ferroli Romeo clock thermostat
Google Nest V3 Opentherm
Honeywell Basicstat Modulation
Honeywell Chronotherm Modulation CMT937
Honeywell Chronotherm Modulation CMT8851A1006
Honeywell Chronotherm Modulation CMT8851M1000
Honeywell Chronotherm Touch
Honeywell Chronotherm Touch Modulation
Honeywell Chronotherm Vision Modulation
Honeywell Chronotherm Wireless Modulation
Honeywell EvoHome with R8810 OT Gateway
Honeywell Lyric T6
Honeywell Lyric T6R
Honeywell Round Modulation
Honeywell Round Modulation T87M1003
Honeywell Round Modulation T87M2018
Honeywell Round Wireless RF (Y87RF1004)
Honeywell Round Wireless RF (Y87RF2008) new model!
Hoval TopTronic-T/RS-OT
ICY Smart Thermostat
Ideal Halo Lite 221358 220360 S/W 1.09 F/W 1.05
Intergas Comfort Touch
iSense RF
Itho daalderop Autotemp MFT
Itho Daalderop Spider
Nefit Easy
Quby (Toon)
Remeha c-Mix Regelmodule + 2x Remeha iSense
Remeha Celcia 20
Remeha iSense
Remeha iSense v19
Remeha iSense v27
Remeha iSense v28
Remeha iSense V30
Remeha Qsense
Salus RT520RF SW V1.9
Salus RT520RF SW V2.2
Siemens QAA73
Siemens QAA73.210
Tado
Tasmota OT adapter
Termet CR 11011 (WKZ0 624000000)
Theben RAM 850 top2
Thermosmart
Viessmann supplied thermostat (unknown model)
Viessmann Vitovent 300 controller
Windhager REG 021A, Theben RAM 786
0  
1  
2                    
3             
4                                                        
5                
6                                      
7                                                        
8                                                      
9                            
10                                            
11                                                      
12                                                 
13                                                        
14                
15                                         
16        
17        
18                     
19                                         
20                                           
21                                                
22                                                
23                                                       
24       
25   
26            
27          
28                            
29                                             
30                                                         
31                                                     
32                                                        
33                                                      
34                                                         
35                                                      
36                                                       
48                          
49                             
50                                                         
56               
57          
58                                                         
59                                                         
63                                                        
70                                                        
71                                                        
72                                                        
73                                                         
74                                                       
77                                                         
78                                                         
79                                                         
80                                                         
82                                                         
85                                                        
86                                                        
87                                                        
88                                                        
89                                                         
90                                                        
98                                                       
99                                                  
100                                       
109                                                 
110                                                 
111                                                 
112                                                 
113                                                      
114                                                       
115                                             
116                                        
117                                                       
118                                                       
119                                           
120                                       
121                                                      
122                                                       
123                                         
124                                               
125                                             
126                                  
127                          
128                                                   
129                                                     
130                                                       
131                                                     
132                                                      
133                                                      
134                                                        
135                                                        
136                                                        
140                                                         
141                                                         
151                                                         
152                                                         
153                                                        
154                                                        
155                                                        
156                                                         
157                                                        
158                                                        
170                                                        
171                                                         
172                                                         
190                                                         
201                                                         
202                                                         
203                                                         
206                                                         
207                                                         
208                                                         
210                                                         
211                                                         
212                                                         
213                                                         
215                                                         
218                                                         
219                                                         
220                                                         
221                                                         
223                                                         
224                                                         
225                                                         
230                                                         
255