water hammer with central heating

greg555 · 5 Jun 2008

Hi,

When my room thermostat reaches temp (the LED turns off) Is it common to hear water hammer? The noise seems to come from above my celling in the living room. (where the motorized valve must be) and can be clearly heard shutting 3-4 times a night.

Could this cause damage?
Is it common to hear water hammer from your heating system?
Should this be silenced or buffered in any way?

additional info- I think I have a combi boiler (its set at 1-1.5)

any replies would be appretiated !!

cheers!,
greg.

Softus · 7 Jun 2008

Sounds like you have a two-port valve and no bypass on a boiler with pump overrun.

LUNAT · 8 Jun 2008

HI

sounds like pump stops immediately when the boiler/burner stops thus causing heat to remain inside the boiler.
1.no by-pass fitted
2.by-pass fitted but closed

Softus · 8 Jun 2008

LUNAT said:
sounds like pump stops immediately when the boiler/burner stops thus causing heat to remain inside the boiler.

What on Earth are you talking about?

namsag · 8 Jun 2008

Danfoss motorised valves have a habit of making a hell of a clunk as they close when they start to wear so if you have one of those that maybe your problem

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water hammer with central heating

greg555

Softus

LUNAT

Softus

namsag

DIYnot Local

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