The burner has been bringing up the water to 170 in less than 1/2 hour.
Seem like 15 or 20 minutes on some mornings. I don't like those short cycles.
And, since the nights are getting down in the teens now, and the den had
some spots that got down to 38F this morning, I've decided to start
using the left-over heat in the burner (87 gallons of warmish water).
Why let it just dissipate up the chimney over night?
(note: The Sanyo is keeping the main living areas at a 21C 24-7)
So, each night before I sleep, I'll open the free-flow valve and let the warm water
circulate around the perimeter of the house, keeping those unheated rooms
from falling into the freezing range..
I'll have to get up early each morning and close the valve too..
If this measure isn't enough to keep the baseboard pipes from freezing in the unheated rooms,
I'll reset the timer to run the burner for 1/2 hour at 2AM..
I guess we can afford two 1/2 hour burns a day, when it's really cold..
Cheers,
Rich