I've been wondering about ways to control the return water temperature on my Worcester 24Ri boiler. The front panel control sets flow temperature leaving the return temperature to its own devices.
Would installing a blending valve be worthwhile to keep the return temperature down to optimum condensing temperature be a good idea?
The aim would be under normal demand conditions to keep the flow temperature as low as possible so condensing mode would be achieved most of the time with a typical 20 degree delta T across the rads, but when in the depths of an arctic blast, I could raise the flow temp setting and yet keep the boiler in condensing mode.
Any thoughts?
TIA
Bob