No heating & no water!


Postby moodman007 » Wed Dec 22, 2010 1:16 pm

Hi. We have no water in the house. All taps/cisterns are empty. Combi boiler has no pressure & heating seems to be off line. Suspicion is that we have a frozen inlet pipe? Possibly underground outside? Snow and very very cold outside. Unsure of type of system. Has combi boiler and no hot or cold header tanks if that helps. If anyone has any ideas please help! Many thanks.
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Postby A-1 Plumber » Thu Dec 23, 2010 5:41 am

U had water and now u dont have any . The boiler needs pressure to run properly ( thats why u install a prv that reduce the pressure) usually around 10-15 psi for residential use. once u turned on any taps in the house w, when the water wasnt coming in , u let go all the pressure that was in both systems .
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Postby jim the plumb » Tue Jan 04, 2011 12:16 pm

I would hope your water is back on by now. Your boiler wouldn't (or shouldn't) drop its pressure by opening a household tap with no mains water pressure behind it. The heating system is a separate system connected to the cold mains by a temporary filling loop.

If it does, then the filling loop may be faulty or the incorrect installation is in breach of the water regulations - in particular the contamination of the clean water supply.

The filling loop should have a check valve to prevent the heating system water getting back into the mains cold water.

The opening and closing of taps, therefore, have no effect on the heating.

I don't know why a pressure reducing valve was mentioned as this isn't necessary as a filling loop is a temporary water connection and should be disconnected once 'topping up' of the boiler is complete (unless built in to the boiler by the manufacturer).

HTH jimbo
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Postby htg engineer » Tue Jan 04, 2011 6:01 pm

A-1 Plumber ??? lol - yeah right

The boiler needs pressure to run properly ( thats why u install a prv that reduce the pressure ??? What ???

The PRV is there as a safety device, so if the pressure does rise to above 3 bar (43.511 psi) this will be operated and the water will be discharged to outside

once u turned on any taps in the house w, when the water wasnt coming in , u let go all the pressure that was in both systems . ???

Rubbish - once you turned on a tap - you drained the hot and cold water pipes only. this would have no affect on system pressure.

Please don't offer advice when you don't know yourself - and change your username - lol

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