mabee the themal coupler needs replacing
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A burner is the part of the boiler that creates and controls the flame that heats the water. If you meant difference between a boiler and a furnace, a boiler makes hot water and a furnace makes hot air.
No. The pilot valve is closed when no flame is sensed by the thermocouple.
The boiler holds a quantity of water - which is heated by gas flame or electric element. The hot water is pumped around the heating system in an endless loop, gradually cooling as it travels. The cooler water returns to the boiler to be re-heated.
Because you are using the Hot water faster than the boiler can produce it. Turn the tap/faucet off a bit. Get the proper sized boiler
its a device use for measuring the salinity of boiler water. it is generally fitted in water drums .its is provided to prevent the flashing off of boiler water under high pressure condition.