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What Your Boiler Pressure Should Be When It's Heated
Oct 02, 2020 · The ideal boiler pressure is often marked as a range in green on the gauge itself. With red indicating the low and high boiler pressure zones. Bear in mind that your boiler may continue to work if the pressure is in these red zones. But if it's shutting down or won't switch on, you've got a problem.
What is the safe pressure for a hot-water-heating system?
Dec 30, 2019 · In any event, the usual cold pressure of a boiler should sit at about 12psi (pounds per square inch). Most pressure gauges display different-colored zones. If the needle sits much outside the green zone, particularly on the high side, you have a problem. Pressure Change Range. Pressure will change when the unit fires up the heat.
The boiler water temperature gage reads 170-180 F at the high point. When the boiler is cold, the pressure is set at 12 psi. The expansion tank is new and was properly pre-pressurized to 12 psi. The expansion tank was sized properly for a boiler of about 100k BTU/Hr and cast iron radiators.
Boiler Pressure: 200: psig: Feedwater temperature: 215 °F: Makeup water temperature: 60 °F: Fuel (oil): 145,000: Btu/gal (@ 80% boiler efficiency) X .80 Available fuel heat: 116,000: Btu/gal (heat reduction) 17,144,238: Btu/day: Heat of liquid at boiler pressure: 362: Btu/lb: Heat of liquid at 60°F:-28: Btu/lb: Heat required: 334: Btu/lb
Principals of Condensing Boiler System Design
Air Pressure Drop in WG (Pa) 0.28 (70) 0.19 (47) Water Pressure Drop ft (m) 11.56 (3.5) 13.7 (4.2) Water Velocity ft/s (m/s) 5.2 (1.6) 4.0 (1.2) Entering Water Temp ˚F (˚C) 120 (49) 180 (82) Leaving Water Temp ˚F (˚C) 100 (38) 100 (38) GPM (l/m) 56.4 (213) 14.4 (55)