Do Wiser Radiator Thermostats fit on all radiator valves?

Wiser will fit 95% of valves. There are a small number of less common valves which may need extra adapters These include Oventrop, Herz, TA, Giacomini, Markaryd, Ondal, Vaillant. If you need support with identifying valves or purchasing adaptors please contact our customer support team.