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Taps get hot water the rads dont - Heating & Cooling

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The Tap water comes from a Domestic water heater. The radiators are heated from a separate source, usually a boiler of some kind. Follow the piping back to that source and see if it is heating. Next, if it has a pump it should be running. Last, look for air bleed ports on each radiator and bleed out any air in them. If nothing comes out when bleeding, air or water, look around the boiler for a water valve and add water till all the radiators are full. If you need more information, write back and try to be more specific. thank you for asking. Please grade the amount of help this has covered. Thanks again. Roger

Posted on Apr 06, 2011

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Posted on Jan 02, 2017

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How do you refill the central heating system on a fortic tank


Close the drain **** .open hot water tap upstairs . releases ball **** tank should fill and water will come out of hot tap keeping air bubble in tank . bleed rads as normal .

May 15, 2017 | Heating & Cooling

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I have to turn the hot water tap on full open to get hot water


Type of water heater is unknown
If you have single-handled faucet the faucet cartridge might be bad.
If you have recirculation system, then check valve might be bad.
Copy following links for troubleshoot.
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Clanging banging" hot water last


System is down. Also the noise means it is "Air-bound"

Mar 06, 2011 | Heating & Cooling

1 Answer

Its takeing a long time for some of radiators to get hot,and when they do they dont get that hot ,iv flushed the system out,could it be heating by-pass valve in the wrong position


hi there

start by turning off the rads that are geting hot,do the colder rads now get hot? try banging them gentle with a rubber mallet around the valves and across the rad.

If the rads are upstairs and the boiler below it may be the pump is showing signs of giving up.
is the circuit balanced correctley?

Dec 18, 2010 | Water Heaters

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I have a 1997 Bravada heat doesn't work new radiator, new water pump, new thermostat what else could be the issue for the heat not working still.


maybe the tap for allowing the water into the heater rad is not opening or the heater rad is blocked check the two hoses coming from the heater rad and see if they both feel the same heat when the engine is hot

Dec 01, 2010 | 1997 Oldsmobile Bravada

1 Answer

Heatslave diverter valve


clicking rads are due to pipe expansion when getting hot.
If the hot water [secondary circuit] gets hot and the boiler stays on [does not keep going on and off] even with a constant low water flow then the diverter should be ok.
there is a valve to prevent the primary circuit [central heating] [ CH] from sending water to the rads. this or its control may be at fault.
both the
Both the CH pipes to & from the boiler should have manual valves to turn off. do this then try the hot tap-full on. If the boiler goes into overheat mode and the overheat stat kicks in to turn the boiler off -- then :-
Check also the heat exchanger, it may be furred up especially if you are in a hard water area. It means taking it off and manually checking [pour water through] If you're lucky it will be just muck to be forced out with hose pipe pressure, if not a new one

Sep 06, 2009 | Water Heaters

1 Answer

Heating circuit getting hot when hot water is running


Check to see if diverter valve is in domestic mode or heating mode.

Jul 04, 2009 | Water Heaters

1 Answer

Overheating Barina


what is heater tap you saying right name for it? if something is blocked the overflow bottlw wouldnt do anything here an idea to check u have 2 hoses running from the rad check if both are hot if not then rad is blocked or water pump is shot sometimes you can tell if water pump is shot is there is a hole near the spindle if it has antifreeze coming out even a little needs to be repaired replace actually more i think about iut you do have water pump prblem

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