On 15/01/2016 19:31, Robert wrote:
On 15/01/2016 02:43, John Rumm wrote:
On 14/01/2016 19:02, Andrew wrote:
On 14/01/2016 13:42, John Rumm wrote:
On 14/01/2016 12:34, Harry Bloomfield wrote:
Has anyone got any thoughts on the correct setting for the temperature
dial on a condensing boiler please?

Its only marked MAX and MIN and has always been left on MAX since it
was
installed a few years ago. Our HW stat is on 80C, because that is
what I
want. Set the boiler output temperature too low and it will constantly
cycle on and off unable to achieve the demand.

Suggestions and your reasoning please?

snip
The solution to this problem is via a system that supports split
temperature operation, (i.e. one that understands the difference
between
running rads and heating a cylinder and uses a higher flow temp for the
the latter). The posh version being weather compensation, that also
understands when its cold outside and makes further adjustments to the
radiator flow temperature in response.

Not all boilers have the controls to do these things.


Could you name some that do ?. I will be looking for a new boiler this
year, possibly, but not necessarily a combi

Most Vaillant, some WB, Some Viseman, and probably quite a number of
others. (I have not been looking at recent models for a few years).



I run my Valliant ecotec Vaillant with HW at ~50C and CH around 60C.
Have the CH low in Autumn/Spring and wind it up if necessary when it get
really cold and windy. ( House is 1800 with stone rubble walls etc and
thus poorly insulated)

I use fitted the weather compensator when I did mine. That means the
heating temperature is driven by a combination of the exterior
temperature and the selected "curve" in the controller. You select a
curve that matches the heat loss of the house.

That means in the less cold periods it will often run flow temperatures
in the 40s and 50s, and only ramp up to over 60 when it starts getting
close to zero. The water however is always heated to 60, and then it
does an anti salmonella cycle on Wednesdays to heat it to 70.

--
Cheers,

John.

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