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In this video, Richard gives some details on how he converted a really badly controlled Worcester 8000 Regular boiler installation into an efficiently controlled system using two flow temperatures, very simply by using an inexpensive 10K Resistor and setting the correct boiler parameters.
Richard used Honeywell Home evohome in the video, however any controls that provide a switched live for heating and hot water could have been used.
Honeywell Home evohome was provided by The EVOHOME Shop - theevohomeshop...