There is a replacement gas valve available for the AR Radiant Heater. The Honeywell VR4705, Teknigas 2443212-45, and Sit 830 Tandem have been replaced by the Sigma Gas Valve, part No. 201857 (https://www.reznor.co.uk/product/sigma-gas-valve/), which will be supplied together with a mini harness, part No. 900375 (https://www.reznor.co.uk/product/lead-to-suit-sigma-gas-valve/).
Is there a replacement gas valve available for the AR Radiant Heater ?
Looking to upgrade your old heater? Look here for information on which product is the best like-for-like replacement.