Peter Hemmings wrote in message ...
Hi,

I have just had trouble justifying the buying of the above to my
neighbour and wondered if, with new boilers they can still be
justified.
Background: I have a Baxi Barcelona fully pumped with two zone valves
(DHW and Htg) with a CM67 in the hall and TRV's on most radiators but
not in the hall. I leave the Heating controller on 24 hours with the
DHW on once a day. I am very happy with the convenience of the
thermostat and its operation in keeping the hall and downstairs at
constant temperatures.

My next door neighbour has had a large extension built with 3 extra
rooms and has ditched his old oil boiler and is fitting a new Valiant
Combi non-condensing boiler. I told him of the benefits and he said
that he was told by the Corgi installer that, as the has TRV's fitted
(maybe to all radiators) and the boiler sensed temperature and was self
regulating (sorry forgot the correct terminology) it would be of no
benefit to him except the convenience of temporary overriding settings
when on holiday etc!!

Unfortunately my argument that it was more efficient in maintaining
temperature went on "deaf ears" as he insisted that TRV's would do the
same on each radiator! Unfortunately I could not think of a reasoned
case for my system and I am now not sure that there is one.

So, (at long last) can someone let me know if they are still
worthwhile in these days of self-regulating high efficiency boilers or
are the now redundant?

Thanks

electronic stats give much better heat regulation than TRVs, and thus
save needless energy use. They also allow different temps for
different times, again saving on energy. They typically pay back their
cost in a couple of years I worked out.


Regards, NT