My residential steam boiler had a low water cutoff and a tiny LED that would light when water got dangerously low–no audible alarm. This unit solved that problem quickly and affordably. The 24VAC Mcdonnell & Miller control had leads for powering either an automatic filler or an alarm (like this one), but neither had ever been installed. So I needed a solution by which the furnace could tell us “low water” (other than waiting for the house to get impossibly cold). This one installed…
My residential steam boiler had a low water cutoff and a tiny LED that would light when water got dangerously low–no audible alarm. This unit solved that problem quickly and affordably. The 24VAC Mcdonnell & Miller control had leads for powering either an automatic filler or an alarm (like this one), but neither had ever been installed. So I needed a solution by which the furnace could tell us “low water” (other than waiting for the house to get impossibly cold). This one installed…
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