Greetings from Norfolk

I have an indirectly heated water supply run as part of our oil heating
system.
With the increasing cost of fuel can anybody recomend the optimum
temperature for the water from the boiler relative to the temperature of the
water thermostat to achieve maximum economy, whilst maintaining hot water.

--
Richard.

"I have yet to see any problem, however complicated, which when looked at in
the right way, did not become still more complicated"
Poul Anderson

"Richard Wrigley"  wrote in message
news:428489ad$1_3@mk-nntp-2.news.uk.tiscali.com...

> Greetings from Norfolk
>
> I have an indirectly heated water supply run as part of our oil heating
> system.
> With the increasing cost of fuel can anybody recomend the optimum
> temperature for the water from the boiler relative to the temperature of
the
> water thermostat to achieve maximum economy, whilst maintaining hot water.
>
>
> Richard.
>


This is usually set to somewhere in the region of 55 degrees C in the summer
months, but increased to something like 65 in the winter time.  It is really
your preference though, and depends on how hot you like your water to be.

Greetings from Norfolk

I agree that it depends upon the temperature I like the water at, but to
heat the water to say 65 deg C it is necessary for the heated water from the
boiler to be hotter than this, but how much hotter for best economy ?

i.e. if I want the water to be 65 deg C, then the water from the boiler must
be at a temperature greater than 65 deg C, but how much.
--
Richard.

"I have yet to see any problem, however complicated, which when looked at in
the right way, did not become still more complicated"
Poul Anderson


"BigWallop"  wrote in message
news:ZJ1he.31311$G8.28543@text.news.blueyonder.co.uk...

>
> "Richard Wrigley"  wrote in message
> news:428489ad$1_3@mk-nntp-2.news.uk.tiscali.com...
> > Greetings from Norfolk
> >
> > I have an indirectly heated water supply run as part of our oil heating
> > system.
> > With the increasing cost of fuel can anybody recomend the optimum
> > temperature for the water from the boiler relative to the temperature of
> the
> > water thermostat to achieve maximum economy, whilst maintaining hot
water.
> >
> >
> > Richard.
> >
>
> This is usually set to somewhere in the region of 55 degrees C in the
summer
> months, but increased to something like 65 in the winter time.  It is
really
> your preference though, and depends on how hot you like your water to be.
>
>

"Richard Wrigley"  wrote in message 
news:4284d231_2@mk-nntp-2.news.uk.tiscali.com...

> Greetings from Norfolk
>
> I agree that it depends upon the temperature I like the water at, but to
> heat the water to say 65 deg C it is necessary for the heated water from 
> the
> boiler to be hotter than this, but how much hotter for best economy ?
>
> i.e. if I want the water to be 65 deg C, then the water from the boiler 
> must
> be at a temperature greater than 65 deg C, but how much.
> --
> Richard.



I may be asking a stupid question here, but how do you control the 
temperature of the water from your boiler?

I assume you have a thermostat on the boiler. If so, then as long as the 
boiler stat is set higher than the thermostat on the hot water tank then 
there should be no difference either economically or timewise in heating the 
hot water.

Adam

In article <kl6he.31478$G8.24569@text.news.blueyonder.co.uk>,
	"ARWadsworth"  writes:

> I may be asking a stupid question here, but how do you control the 
> temperature of the water from your boiler?
> 
> I assume you have a thermostat on the boiler. If so, then as long as the 
> boiler stat is set higher than the thermostat on the hot water tank then 
> there should be no difference either economically or timewise in heating the 
> hot water.


Well, in theory the boiler gets more efficient at lower set
temperatures as it will extract more of the energy from the
combustion fumes. However, a non-condensing boiler must
always be set higher than the dew point of the combustion
fumes, or there's a risk condensation will form inside the
boiler and/or flue pipework, quickly wrecking the boiler.
For a gas boiler, the dew point is normally about 55C so
you should never set it below 60C. I don't know what the
equivalent figures are for oil fired boilers.

(Obviously, a condensing boiler is designed to work below
the dew point, and to handle the condensate produced in the
heat exchanger and flue pipework, and consequently work
more efficiently.)

-- 
Andrew Gabriel

"Andrew Gabriel"  wrote in message 
news:4284fd05$0$38037$5a6aecb4@news.aaisp.net.uk...

> In article <kl6he.31478$G8.24569@text.news.blueyonder.co.uk>,
> "ARWadsworth"  writes:
>> I may be asking a stupid question here, but how do you control the
>> temperature of the water from your boiler?
>>
>> I assume you have a thermostat on the boiler. If so, then as long as the
>> boiler stat is set higher than the thermostat on the hot water tank then
>> there should be no difference either economically or timewise in heating 
>> the
>> hot water.
>
> Well, in theory the boiler gets more efficient at lower set
> temperatures as it will extract more of the energy from the
> combustion fumes. However, a non-condensing boiler must
> always be set higher than the dew point of the combustion
> fumes, or there's a risk condensation will form inside the
> boiler and/or flue pipework, quickly wrecking the boiler.
> For a gas boiler, the dew point is normally about 55C so
> you should never set it below 60C. I don't know what the
> equivalent figures are for oil fired boilers.
>
> (Obviously, a condensing boiler is designed to work below
> the dew point, and to handle the condensate produced in the
> heat exchanger and flue pipework, and consequently work
> more efficiently.)
>
> -- 
> Andrew Gabriel


Andrew

What is the thermostat on an older type of boiler reading? eg my Ideal 
Mexico 2 that I threw away last year.

Adam

In article <sqFhe.32254$G8.29279@text.news.blueyonder.co.uk>,
	"ARWadsworth"  writes:

> Andrew
> 
> What is the thermostat on an older type of boiler reading? eg my Ideal 
> Mexico 2 that I threw away last year.


Unless it's marked in temperature (which my parents' old
Ideal Standard was), or the manual translates the markings to
temperatures, then I've no idea. You could buy a clip-on pipe
thermometer and clip it to the flow pipe from the boiler.
(These work much better with a large blob of heatsink compound
thermally connecting the thermometer to the pipe.)

-- 
Andrew Gabriel