For systems that use coils to heat domestic hot water, the high limit setting is 210°F and the low limit setting 140°F. Watch out for overheating. Overheating also is the main cause of leaking. Oil-fired heating systems distribute heat in one of three ways: warm air through vents, hot water through baseboards, or steam through radiators. I went out last night and took a temperature reading of the pipe carrying water into the house and the pipe coming back. All I have to work with is a simple mechanical thermostat with one setting. When the thermostat clicks on, the relay causes the boiler to circulate hot water through the system without turning on the boiler. It's highly likely that for most of the winter, you could heat the house with lower temp water. Be sure that the firing rate of the appliance does not exceed the specifications in the tables below. If you have a traditional style central heating system, as most UK homes do, then your radiators are controlled by your boiler. Using combustion test instruments, perform a smoke test. If you use a heat-purging boiler control such as the Intellicon 3250 or it's cousin the Beckett Heat manager, the savings are similar to using "outdoor reset" type controls on a high-mass cast iron boiler, in part because the average temp of the water is lower, and the boiler is "parked" at a lower temp during standby, for lower standby losses. And the worst way to run an oil boiler is have it short cycle as you lose a bit of oil … I have an old boiler (66 years old) heating my house. A time delay relay is a way to squeeze the most heat out of your system without running the boiler. Once a boiler starts to go over 212°F, you can face serious problems. Boiler Settings. We always have the oil boiler set to 90 degrees and still this doesn't make the radiators that hot so the house is relatively cold. After a set time, the boiler will fire up. The rooms get a little warm if you close the doors - it's very uncomfortable overall. Most boilers have a min/max setting - yours may be set too close together. It is too old to have an off temperature setting. If a boiler has reached 220°F, a sudden drop in pressure could cause the tank to burst. That maintains the temperature at 18 (assuming outside temperature is not too cold at about 5). It can be raised as high as 210°F if needed in severe weather. Your thermostat senses that the room temperature has fallen below your thermostat setting and sends a signal to your heating system to provide heat for your home. Also, you may need to consider an outdoor reset control that will adjust the boiler's temp based on the outside temp (thus load). Also, radiators output more the hotter they are. I set the on temp around 180 degrees and it shuts down whenever the thermostat clicks off. Verify that the over fire draft is set according to the manufacturer’s recommendations (usually -.01″ to -.02 ” W.C.). If you notice that your boiler’s temperature is going higher than the above settings, you have a major problem. Adjust the air setting until a trace of smoke is obtained. It's a 12kW output boiler. Oil boilers are either on or off so if you set the water temperature on the boiler below max then all that happens is the boiler cuts out when the thermostat demands heat. The average setting for the aquastat (the temperature control device on a boiler) for a forced hot water system is 180°F. The key to saving energy here is not to set it higher than you need. You set the temperature the boiler heats the water to, which is then pumped through the radiators to heat them up. On a mild day it runs at 100% for 30 minutes to get the house to around 18 degrees (from a cool 12 degrees). Then it runs at about 25% (using 3kW) until I turn it off. 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