On 4/7/18 12:45 PM, Ed Pawlowski wrote:

I mentioned that he has a boiler and it has a high limit
switch that turns off the burner, but there was no response.

OP here.
If there's a "high limit" switch, it hasn't activated.
(that would be on the aquastat, right?)

I don't really want the furnace cycling on/off repeatedly,
just to maintain a specific setting on the thermostat by
(say) +/- 1 degree, or even 2 degrees.

I don't mind a drop of 3-4 degrees (or even a bit more)
between having it run.

What's really so hard to understand about that?

Having said that, I guess there really isn't a product on
the market that can do this. If I was creative, I'd -build-
one. Just to prove it could be done.

I may try using the DIP setting that's supposed to limit
cycling to once per hour, and let it go at that.

Thanks for your contributions, anyway...