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The Smart Thermostat Shop is our new home for Honeywell Home evohome products

Are My Radiator Valves Compatible?

The Honeywell Home evohome HR91 & HR92 Radiator Controllers, and the Drayton Wiser Radiator Thermostats, are compatible with most manufacturers of Thermostatic Radiator Valves (TRV’s) with M30 x 1.5mm threaded thermostatic heads.

However, they are not always compatible with current and existing TRV’s due to cheap imports and different manufacturing standards. We also recommend that consideration be made to replacing TRV’s over 15 years old, as they may not function properly due to age which would prevent the evohome system from controlling the heating system correctly.

For a TRV to somewhere near compatible, the TRV should look something like Honeywell’s VHL120-15A

The dimension across the diameter of the thread should measure 30mm and the ‘thread pitch’ should measure 1.5mm (thread pitch is the measurement of one thread to the next).  The pin height when measured from the top of the valve thread should measure approximately 14mm and the radiator valve must fully close when the pin is pressed no more than 4mm (most thermostatic radiator valves will close with only 2mm of pin movement).

A short video below demonstrates what you should look for when deciding if your radiator valve is compatible with Honeywell evohome Radiator Controllers.

We have compiled a table below listing some of the popular current and existing TRV’s that fit with the HR91 & HR92 Radiator Controllers and Wiser Radiator Thermostats (we appreciate they are not all listed here). We also have some Honeywell TRV adapters available to purchase in our shop that will allow certain non-compatible TRV’s (listed below) to accept Honeywell evohome HR91 & HR92 Radiator Controllers.

If you are still unsure about the compatibility of your TRV, please email us at and we may be able to identify what TRV(s) you have. We cannot promise to identify all TRV’s and in cases where we are not sure, we would recommend replacing them with the valves manufactured by Resideo for the evohome system, available to purchase on our website.

Manufacturer Brand Adaptor Required?
Altecnic Ecocal No
B&Q Regis No
Caleffi ECOCAL No
Caleffi 200, 201 & 203 No
Comap Westherm 4 Yes – ACH28
Comap Westherm 5 Yes – ACH28
Comap Westherm 6 No
Comap Senso TRV Yes – ACH28
Comap S2 TRV Yes – ACH28
Danfoss RAS C & C2 Yes – Supplied
Danfoss RAS D & D2 Yes – Supplied
Danfoss RAV & RAVL Yes – EVA1
Drayton RT212 No
Drayton RT414 No
Drayton TRV4 No
Drayton TRV3 Not Compatible
Drayton TRV2 Not Compatible
Grahams Altech No
Grasslin Tower TRV REV No
Honeywell (Herz) 7230, 7235, 7260, 7262 Yes – ACH28
Honeywell Rad plan No
Honeywell VT117E No
Honeywell VT200E No
Honeywell VT15 No
IMI Hydronic Engineering Eclipse No
IMI Hydronic Engineering Calypso No
MYSON TRV 2WAY (Old) Yes – ACH28
MYSON Petite No
Orkli Not Compatible
Pegler Yorkshire Terrier 1, 2 & 3 No
Pegler Yorkshire Mistral 1 & 2 No
Pegler Yorkshire Belmont 4 No
Pegler Yorkshire (Wolseley) Bulldog No
PTS Boss Supreme Not Compatible
PTS Boss Supreme Plus No
PTS Tradesave No
Screwfix Unbranded TRV No
Siemens TRV MTN51GB TRV No
Siemens TRADE Not Compatible
Trago Mills Unbranded TRV No
Travis Perkins IFLO No
Travis Perkins IFLO Contract No

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