Cast-iron boilers perform to modern standards
Cast-iron boilers meet modern standards — Hamworthy’s Purewell VariHeat range.
Hamworthy Heating’s Purewell VariHeat range of boilers has been designed as a direct replacement for traditional cast-iron atmospheric boilers. These boilers occupy the same space as their predecessors, but have 50% higher output, exceptional seasonal efficiency and exceed the Building Regulations coming into effect in April 2006. These cast-iron condensing boilers have fully modulating pre-mix gas-fired burners. The cast-iron heat exchanger has a down-firing pre-mix burner. A secondary heat exchanger at the base of the boiler maximises heat recovery from flue gases. Efficiency at full load is 104% net, rising to 108% at part load. Five models provide outputs from 70 to 180 kW. VariHeat boilers can be installed individually or in a multiple installation with up to six boilers on a single flue header.