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Thanks. The DT90E model is said to be more efficient due to the TPI control and is roughly the same price as the DT200, but can my old boiler cope with it or am I just tinkering around the edges with an old and very inefficient system and it won't make much difference either way!

I have an elderly central heating system consisting of a Potterton Netaheat 16-22 boiler, with room and cylinder thermostats which give independent control of heating & hw by means of a 3 position motorised valve (Honeywell Sundial Y wiring). The Potterton room thermostat is now wildly...