"harry" wrote in message
...
On Oct 19, 6:43 pm, "Ed Pawlowski" wrote:
"LSMFT" wrote in message
Jim
It's a wood boiler and I do it that way manually now and it works
great.
The problem is that when the fire goes down the circulator runs all the
time unless I shut it off.

Sounds like you need an aquastat to control the circulator. It will shut
off below a set water temperature.

Pointless unless the boiler has a thermostat.

He already said it has a thermostat. If the T-stat is calling for heat it
will start the circulator even if there is no fire. An Aquastat keeps the
water from circulating unless it is hot enough.