I don't know what you meant by this
All I was saying that the new heaters will need to be LOT 20 compliant and dimplex
do the Quantum ones but they require 2 supply's
Old night stores are not LOT 20 compliant and you will find it hard to get them .Dimplex do the Quantum heater's that are. but you need a 24 hour supply plus the off peak supply .