Question :- Boiler + radiators efficeny ....
this may sound like a odd question ,but you D.I.Y'ers seem to know your
stuff , basically with gas going up in price , i've decided in rooms with 2
radiators , to have only 1 of them turned on and the other one turned off ,
seems to take longer for the room to get warm etc , but i'm happy enough.
But my question is , will my heating costs drop ? will a combi boiler use
as much gas for say only half the radiators been used at any one time? as it
would , if all radiators where been used?
my house is a standard type 3 bed semi brick built , i have 9 radiators in
am i making a 35-45 % saving ?
Not likely, if you are heating the room to the same temperature as before.
If you are happy with a lower room temperature, then achieving that with
two radiators and a lower thermostat setting should cost less. With only
one radiator, you are likely to have to run the primary circuit hotter
and longer - which is less efficient. You are more likely to have parts
of the room far hotter than they need and others far colder. Which is
If you have lots of radiators, most of the energy that you are paying
for will be useful heat. The less radiators you have, the greater the
percentage of energy that will be wasted rather than doing useful work.
Ultimately, with no radiators, all of your gas bill will be for waste
Turning off radiators in rooms that you want heated is generally
counterproductive. If you want to save money, turn the thermostat down.
Every degree higher you set that costs proportionately more. It costs a
lot more to raise the room temperature from 25 to 26 degrees than from
17 to 18 degrees. Even better, have individual room, area or radiator
thermostats so that you don't heat any area to a higher temperature than
it has to be. eg a bedroom need not be at the same temperature as a
I'm afraid that your economy measure in turning off radiators in rooms
that you want to heat is actually going to increase your heating bills,
not cut them..
Unlikely. Personally I would look at heat losses. If you haven't got 10
inches of loft insulation (which can be DIY) and cavity wall insulation, and
it is possible to have this work done, these would probably give you the
35-45 % savings that you are looking for.
Hi , thank you all for your feedback , i was hoping , but it appears not ,
that using only 1 out of 2 radiators in each room i would be using e.g 50%
less gas , a bit like only having 1 bar on the electric fire instead of
so your opinions point me towards , having all the rads on , but at a lower
temp , great advice .
If you can make this work then bills will no longer be a problem to you. You
will have discovered a way of creating more output energy for less input
energy. The Holy Grail. People will be beating a path to your (exceedingly
warm) door to throw money at you.
I have a slightly different slant on the OP question....
I have 4 rooms I never use and have turned the radiators off, am I like the
original poster kidding myself about cost savings? The system has 15
In general, if those rooms are at a significantly lower temperature than
otherwise would be the case, then yes, you are saving on heating costs.
There are, of course, exceptions:
If one of the rooms has the controlling thermostat in it, then no, you
will quite possibly be paying more as the temperature of the heated part
of the house isn't really under proper control.
If one or more of the rooms gets so cold and damp that damage to
contents or the building results - then it could be a false economy.
If the room has plumbing, in it or passing it, eg a hand basin, and that
freezes and bursts - then it could be a false economy.
So, in some cases, it may be better to have the radiators in those
rooms on a little.. In which case, thermostatic radiator valves may be
A few. The cost, for a start - particularly if you have to pay someone
to fit them.
IME, they tend to seize if set to a low temperature and so are "off" for
many, many months (years?) at a time.
Also, IME, they can be difficult to get the right setting when used in a
room that is only needs a little heating. It needs a lot of trial and
error to get it right.
So the end result isn't significantly better than using conventional
valves and relying on the house/zone thermostat to control the heating
Just keep an eye out for where damp may be causing problems.. Every time
the door is open, warm air will enter and water vapour within it will
tend to condense out. Also the water in the steam iron will go
/somewhere/. Moving the furniture, now and again, to look at the walls
behind might not go amiss. Any damp spots are better found earlier than
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