In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
and an offer.
We often talk here about "pickup factor" (in steam) or "mod/con" (in hydronics) etc. And in large power boilers, variable firing rates are common -- they have to be. But I have yet to see or hear of really good variable firing for residential or small commercial use.
Now with at least some types of gas burners it doesn't seem to be that hard to achieve variable firing; there seem to be options out there.
But not all of us have reasonable access to gas.
And back in the bad old days, there were devices -- beautiful devices -- for coal fired boilers which varied the draught according to the pressure in the system (look at some of Dan's wonderful historical documents).
So. Here is the challenge. Would some oil burner manufacturer be interested in working on an oil burner design which had at least a 3 to 1 turn down from full fire to low fire (more would be better -- gas turbines achieve at least 10 to 1 turn down) but which maintained a proper flame pattern in the fire chamber over the entire range and which maintained a proper fuel/air ratio for maximum efficiency (and minimum air pollution) over the entire turn down range? I envision something with a controllled oil flow (could this be done with variable pressure? Or would it need a variable nozzle pattern as well?) and a controlled air flow (perhaps working on a feedback from an oxygen sensor or two?)(probably requiring both control of forced draught as well as over fire and stack draughts) all responding -- very sensitively -- to a steam pressure sensor.
Here is the offer: if some manufacturer is interested in developing such a contraption, and would provide the installation and tech. support, I would be interested in letting them play with my system...
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-McClain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch