>> Re the “non thermostatic valve radiator” it used to be practice to use the bathroom
>> radiator as the bypass so it could act as or in fact be a towel
>> rail, useful in summer months when just hot water was selected.
The back boiler in my old house used thermo-syphon for the hot water cylinder in the airing cupboard. That meant all the upstairs rads and to a smaller degree the downstairs rads would come on without the pump going. During the very hot weather I'd close down all but the bathroom rad, which would be left open at a minimum.
Can't do this at the new place. SWMBO's not happy, because she no longer has an effective airing cupboard. The airing cupboard in the new place has a small rad in it, but that only gets warm when the t/stat turns the heating on.
Those designers of the older systems knew what they were doing!
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