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Gravity Hot Water
Pumped Heating
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| Gravity hot water
is just that, when the clock is in the on position the boiler’s burner (Cast
Iron) lights and a large volume of water is heated up. Because hot water is
lighter than cold water, the hot water from boiler rises up to the cylinder and
the cooler water (heavier) drops back to the boiler. If the room thermostat is
calling for heat this simply switches the pump on, circulating the heat to the
radiators. It is not possible to have heating without hot water. This system can
be used with a Primatic cylinder or an indirect cylinder (often fitted with back
boiler fires). Usually no cylinder thermostat is fitted so the only temperature
control for the hot water is the boiler thermostat. This type of system can be
expensive to run but extremely reliable. |
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Possible Problems
No Hot water - could be that the Ball cock is stuck
in the closed position and the tank is empty
No heating- this is probably the pump, could just
be stuck if it has not been used recently
Excessive air in the radiators- it is probably the
antigravity valve that need replacing on the Heating flow
Upstairs radiators get hot when the heating is not
on - the antigravity valve is stuck
this is located just above the boiler on the heating flow
pipe
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