Classification of boilers – High-pressure boilers are boilers operating at a steam or other vapor pressure in excess of 15 psig, or a water or other liquid boiler in which the pressure exceeds 160 psig, or has a temperature greater than 250 degrees Fahrenheit. Others are low-pressure boilers. License requirement
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Basics of hot water heating boilers - Specifying Engineer
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Individual High Limit and Low Limit relay switches On heating boilers: these may be provided on older heating boilers. A separate high limit control, usually mounted near the top of the heating boiler monitors boiler temperature and shuts off the oil or gas burner when that limit has been reached. A separate low limit control (that looks like the high limit unit), usually mounted lower on the heating boiler monitors …
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Tips for a Successful Steam Boiler Replacement | U.S
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Setting a high limit at 180 or above is wasteful. I set my high limit at 160. The lower boiler temp is unnoticeable in the home heating. Actually my oil bill dropped 25%.
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Aquastat settings: Best High, Low, & DIFF Settings on a
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In a low-pressure boiler the pressure does not exceed 15 psi, and hot water heating boilers are not designed to exceed over 260 psig. The temperature in a low-pressure boiler will not rise above 250 degrees F.
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