In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
If you go this route, don't forget that you'll have to fill it with glycol - in spite of what the instructions may say. If you lose power when it's cold, there's nothing to keep the HX and external piping from freezing.
1.5 million steam boiler .
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It doesn't require power. The terminals are plain switches, and it is wired in series will all your other safeties.
What valves are you opening here? The weekly flush of the LWCO should suffice: (open drain valve until running clear).
You could do a monthly flush of the boiler drains to remove any accumulated sediment.
Opening all the valves once a week might introduce 4 or 5 gallons of fresh oxygenated water into a system which may not fire for a few hours, thus exposing those thinner pipes to corrosion.—NBC