I've now visited elderly relative armed with the helpful advice about
her central heating system given
in December. May I check what I think I found?
The b/g in brief was that British Gas had told her she had to leave one
radiator on full as she had no room stat. What I found was:
a. a Glow-worm Economy 40B boiler (in a vented system);
b. the installation instructions for the boiler require a bypass,
with a lockshield valve, between the flow and return; and
c. what seems to be a such a bypass fitted in the airing cupboard -
several meters from the boiler. (I only say "seems" as one end is behind
the HW tank where I'd need an endoscope to prove it).
Does that all confirm BG's advice being (no doubt well-intentioned)
She's agreed to let me fit a room stat in the spring. (She has a
sensible view of my ability to get things right first time.) There's an
RWB252 programmer which she really, really does not want to change. That
allegedly has a standard backplate. So can I simply drop a wireless
thermostat as recommended by Adam between the "CH On" output and the
pump? (Plus the manual by-pass switch Adam also helpfully recommended
and which I know from experience with her security lights she'll find a
reply to address is (meant to be) valid
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