British Gas engineers clarified that these numbers detect the room's temperature and then adjust the radiator to achieve the desired warmth.
'I'm a British Gas engineer and this is what the numbers on your radiator mean' Heating can quickly escalate your energy bills and cause a host of problems in homes.
TRVs feature a dial with numbers typically ranging from zero to five, each corresponding to a specific temperature range, reports the Express.
Many people turn their radiator knobs without understanding what the small numbers signify when the chilly weather arrives.
These numbers aren't merely decorative - they're found on thermostatic radiator valves (TRVs), which are numbered from one to five.
