Our Gas Safe heating engineers successfully upgraded an existing heating system in Woodford Green that was putting pressure on the boiler and its pump. This system comprised 3 circuits: 2 underfloor heating circuits and 1 unvented hot water cylinder circuit, each with a pump. The boiler was a Baxi Potterton Promax system boiler with an Grundfos 15-60 internal pump. In this system, up to three pumps were operating through the boiler depending on circuit demand - ranging from a
