I need to replace some TRVs on my central heating system before the winter. Looking online I notice that the price seems to vary enormously! I can pay anything from about £7 each to about £40! Is there any appreciable difference in quality? I notice some are wax and some are liquid sensing. some seem to be EST approved. Some are complint with BS 2767-10 and others to EN 215.
Also, most seem to be 15mm angled. All mine are angled, but is there any way I can tell if they're 15mm? System is about 15 years old.
Also, most seem to be 15mm angled. All mine are angled, but is there any way I can tell if they're 15mm? System is about 15 years old.