I want to install Smart Thermostat knobs onto my radiators, and on most of my radiator valves I succeed without problems, even without adapters, but on some the thread just won’t fit, even with the adapters that are included with the Smart Thermostat. These radiator valves seem to have a slightly smaller thread and the original head is branded “Comap”. Still, I can’t find adapters for “Comap” anywhere…
Which adapter do I need ?
Most Smart Thermostats can be screwed onto any M30x1.5 radiator valve (which is sort-of the standard these days) and most Smart Thermostats come with some adapters (usually for RA, RAV and RAVL valves) but the “Comap” head you are talking about is a M28x1.5 (usually referred to as a “Heart” (or “Herz” in German) valve.
So all you need to do is find the right adapter. For your “Comap” valve that is a M28x1.5-to-M30x1.5 adapter. All Tado Smart Thermostats do have this adapter included, but if your Smart Thermostat is from a different brand, you will need an adapter like this one :
Heimeier / Herz adapter (buy it on Amazon)
That’s it !