Annual oil boiler service just done. The engineer was surprised that
the house, built in 2004, doesn't have a room thermostat in any room.
Apparently, from 2005 on this became a requirement.
Anyway, he said there are wireless thermostats available that can be
connected to the system. He mentioned one from Siemens that he said
was very good. (I have total faith in this engineer, by the way. He
has always provided good service.)
Now, is this a good idea or a waste of money (it'd cost around £130
for the part and the labour)?
Lacking a room stat, it will cycle on the boiler stat continuously
while ever it is turned on - I assume it must use TRV's. A room stat
would shut both boiler and pump off when the the set temperature is
reached, so well worth the money.
OK, but where do you put it? Traditionally in the hall but that would be
totally inappropriate in my house. OK in the main living area (if you have
one) but it's likely to get set high if people elsewhere complain that their
heating keep shutting off.
All my rads have TRVs apart from the rad in the hall where the wireless room
stat/programmer is located. It's always seemed a mystery to me why you
should need a room stat *and* TRV's because they are often fighting against
one another! If the hall reaches temperature then the stat will shut down
the boiler even if the TRVs in other rooms are calling for heat. Doesn't
seem to make sense...
What you do is balance the (hall) rad so its low output, then all the
heat goes to the TRV rads till the rooms are warm. Once they shut down
the hall warms up, and once that happens, master stat shuts off the PUMP.
I got one for about £12.95 this January.
I wired it near the CH programmer (which happened to be in the kitchen), in
series with the control cable.
But, I suppose it could go anywhere where the ambient temperature is typical
of the rest of the house (or it can always be set a bit higher or lower to
compensate), and is easy to connect to the boiler (but not right next to
(My TRVs are almost totally useless; they go from 1 (or is it *) to 5. If
set at 2, the radiator never gets hot. If set at 3, it never gets cold! If
by some miracle the temperature of the rad is just right, then as soon as
the weather changes a little, it needs adjusting again. Why aren't they
calibrated in degrees?)
Calibrated markings would be meaningless as you're wanting to set the
temperature of the room for the main occupancy space on something that
sits 6" above the floor next to a radiator. Relative markings (hence 1
to 5) therefore make far more sense: if the current setting doesn't
heat the room up high enough, turn it up - and vice versa.
Yours sound like they've almost certainly failed and no longer
responding to the variations in temperature (hence they are for all
intents and purposes manual wheelhead valves). Indeed, they don't last
forever - cheap(er) ones particularly - do you know what make/model/
age they are?
On Sat, 5 Mar 2011 15:01:58 -0800 (PST), Mathew Newton
My TRVs are Honeywell -- the boiler engineer who came on Friday said
they're good quality kit -- and I find them just as much a PITA as
BartC does his. My house was built in 2004. Trying to adjust the TRVs
to give exactly the right results is an exercise in futility.
They are susceptible to the temperature of the pipes, so if the boiler is
firing infrequently the TRV will open up due to being cold for some time. In
less cold weather, this causes an overshoot; in cold weather an undershoot.
TRVs need to be turned down and up to adjust for what the boiler's doing,
Last year, as I removed and replaced each radiator in turn, I turned the
TRVs to the horizontal position and that seems to have stabilised them
Has the heating system ever been balanced? To do properly takes a
quite a while so it's rarely, if ever, done by builders/installers.
OK when the TRV's start to shut down rads it'll screw the balance but
in the general heating from cool the system would perform better.
I find that their close proximity to the radiator makes them almost
useless, beyond a very crude form of wet finger stab.
Even the digital wiresless stat needs a couple of degrees up in really
cold dry weather. I feel cold when the air is dry in the house.
But they are better than nothing.
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