The e-tec range features a brand new stainless steel heat exchanger and is our smallest combi yet. Wondering about how energy efficient your new boiler will really be? Advice and grants to improve energy efficiency. Is your old boiler on the blink, and you have no hot water ? Call our team on or complete our. Wondering if your boiler needs repairing or replacing? Note; on systems volumes greater than l an additional external expansion vessel will be required. Are you sure you would like to leave?.