Boiler stoves

[Mull]

Just a question about the pipe stats on boiler stoves, I have a stat on pipe at bottom of cylinder coil and another at top of coil, bottom stat set at 45, top at 90 to avoid boiling.

Is this standard for boiler stoves? it does take a while for bottom stat to reach 45 and switch pump on.

[Goaty]

Not a plumber. Depending on what tank set up you have, Hot stratifies to the top and you need a large portion of the tank hot before it takes the hot out. Otherwise it would rapidly cool to a useless temperature. So it makes sense and 45 isn't that hot.

[Mull]

Not a plumber. Depending on what tank set up you have, Hot stratifies to the top and you need a large portion of the tank hot before it takes the hot out. Otherwise it would rapidly cool to a useless temperature. So it makes sense and 45 isn't that hot.

 

Agreed, 45 isn't that hot but that is the temp at bottom of cylinder so water temp of circulating water is much greater,

Think stove is probably too big, room gets too hot while trying to get rads on and to keep rads going you need to keep piling on the logs, just have to live with it I guess.

[Goaty]

Just another thought does your tank have alternative bungs you could use higher up. Mine does.

[Jony thicket]

Surely both stats should be on the top pipe, ie the flow from the boiler. This would mean the pump will come on sooner.

[Mull]

Surely both stats should be on the top pipe, ie the flow from the boiler. This would mean the pump will come on sooner.

 

Pretty sure it said in the manual that 45 stat should be on the return.

So, small cylinder, pump would be on sooner than big cylinder.

Not easy to find a happy medium.

Also if someone has a bath you are back to square one.

We have gallons of hot water on tap but rads don't seem to be meeting requirements.

[Tom D]

You sure the return stay isn't a cold water stat to switch off the pump when the return water is too cold?

[Mull]

You sure the return stay isn't a cold water stat to switch off the pump when the return water is too cold?

 

Was under the impression top stat was a safety to override bottom stat which switches pump on and off.

But you are right as well, when temp reaches 45 stat turns on, then below 45 it goes off.

[arbwork]

just a thought I was looking at a friends system the other day and the stats were on the pipes adjacent to the back boiler and not the tank, this was as directed in the stove's diagram

[arbwork]

yes just checked this out see here http://www.hunterstoves.co.uk/Assets/Old_Instructions/Herald%2014%20Wet%20CE%20Instructions%20V.11.07.pdf clear advise on this