Description: This expanded product line includes Evergreen®, Ultra™ Series 4, and GV90+ ® cast-iron boilers. All operate with natural or propane gas and feature the latest hydronic heating technology.

Ray™ is a high-efficiency, low-mass fully condensing cast iron boiler. The residential unit can run on either natural gas or propane; no conversion kit is required. It delivers 40,000-199,000 Btuh at ...

ELECTRICITY CAN be made from the sun, the wind or the atom rather than by burning fossil fuels. Cars, buses and perhaps even lorries can be powered by batteries rather than petrol or diesel. But other ...