I have this old HS Tarm multi-fuel boiler that we use for heat
(forced hotwater) in the winter and hot water in the summer..
Normally during the summer the boiler was set to about 170 F and left to run all summer.
It used from 1 to 2 gallons of oil a day, depending on hot water demands.
The Mods:
Last winter, I added a 7512 Beckett Heat manager to control the cycle time of the burner,
it cuts down short cycling. It works pretty well during the heating season..
I also replaced the burner control unit with a more modern unit that
does not keep the high voltage spark running during the entire burn cycle.
(Saving on Electricity and wear on the probes. Also cuts down the noise).
Honeywell R7184A1034 M/h R7184a-10
It also has a diagnostic button that flashes an LED to report the brightness
of the flame picked up by the light sensor inside the burner.
After finding the top cover of the boiler always felt warm to the touch,
I installed layered foil-bubble insulation on top of the boiler.
It now feels COLD to the touch! Also added better insulation to many of the
pipes going into the boiler. The rate of cooling is much lower now.
Replaced the oil wasting injector tip with a 1.0 GPH tip, which gives us
lots of hot water within 15 to 20 minutes.
Turned down the max boiler temp to 160 degrees F.
Turned on the aux heat/sani functions on the dishwasher.
Hypermiling the hotwater:
This summer, we are using the switch in the kitchen to control the amount
of time the boiler is burning oil. We call it
Hot Water on the demand. 
When we need water, we run the burner for 20 minutes (1/3 of a gallon).
That normally provides us with enough hot (and warm) water for the day.
If water was heated during the evening, there is water left over for
showers the next morning and it might not get turned on at all the next day..
Since April, we have used about 1/8 tank of oil (275 gal tank).
Either the meter is wrong, or we have saved a lot of oil this summer!
There is come confusion about the amount of oil used. Since we got the
Short fill up (100 gallons) in April that took the meter to the 1/2 mark.
1/2 of 275 is 137.5 gallons. This week, we got a real fill up.
That fill total was 144.5 gallons.
It seems we were still very close to having 1/2 a tank.?.
I need an SG2 for my Boiler!
