Combined master radiator and gas boiler for the Servowarm small-bore central heating system, with integral thermostat and electric pump, made of steel and painted white, developed in Birmingham by Frederick Carr in 1962 and launched in 1964, by Servotomic Ltd., London (a division of GKN), 1965 Combined master radiator and gas boiler for the Servowarm small-bore central heating system 1965
