guernseyguy
Registered User
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- 21
Surely turning off rads reduces oil usage? Any advice on this would be welcome.
The burn time defines the oil usage.
The number of rads "on" defines where the resultant energy is located.
You should be reducing the time the burned comes "on" for as opposed to turning off rads.
do you have a temputure sensor/ thermometer?Hi all, I have my oil heating set to come on for 2.5 hours every evening to heat 6 rooms. In order to reduce oil usage, I turned off a couple of rads in 2 of the rooms that are rarely occupied. My O/H says turning off rads makes no difference and that to reduce oil usage, I need to cut back on the length of time the burner is on. Surely turning off rads reduces oil usage? Any advice on this would be welcome.
: you need to take a holistic view of your home and energy usage.In order to reduce oil usage
Whilst true in as far as the statement goes "The burn time defines the oil usage." the "burn" time will obviously be shorter the less of a load is put on the boiler, ie. less rads turned on.
Is the system demand driven by the rads at set temperatures, or supply driven by the heat produced by the boiler for a set time?
Hi all, I have my oil heating set to come on for 2.5 hours every evening to heat 6 rooms.
That seems to be at variance with the OPs first post.
Absolutly, of course it does, the energy that would have gone into those rads will now go into the rads that are on and therefore those rooms will heat up quicker and therefore the boiler will be "called for heat" less often, thus saving fuel.
Well not really as this will only happen if there is a room thermostat installed. If not, by relying on the boiler thermostat will use more fuel. A domestic oil boiler is not modulating. By turning off radiators, it will just put the boiler in short cycling mode, turning itself off and on more frequently and thus using more oil. I suppose it's like driving a large engined Mercedes in stop start traffic, compared to driving at 100kph on a motorway.
Shane, forget about modulating pumps/boilers and so forth, in most situations if the load on a boiler is reduced from say, 25KW to 15KW then (as enegy cannot be destroyed/created) the amount of fuel used to produce 15KW of heat for 2.5 hours will be less than producing 25KW of heat for the same time.
I fully accept that effieciency may suffer if loads are not balanced.
I KNOW for a fact that if I have ALL rads on in my house I use more fuel over any given time as opposed to having some turned off.
My point is, using Guernseyguy's boiler as an example, this boiler has a 0.85 80 S nozzle. This will be using at 7.0 bar pressure 0.85 US gallons/hour. The probable pump pressure is somewhere between 8 and 9bar therefore more fuel used. By not requiring the extra demand, this boiler could be downsized to use 0.65 outputting 26kW. This will give a 25% saving in fuel with no loss of heat.
With regard to your situation, having an oversized boiler will use more fuel than an undersized one and it will keep the boiler in short cycyling mode. It will also have the keep the boiler/burner components at an excessively high temperature leading to more failures as the heat is not being transferred from the boiler into the heating system.
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