vent thingymagigy
- Thread starter bster
- Start date
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good old fashioned prv,s that leak down the side off the pipe. designed to protect open vented boiler,s incase of blockages or freezing.
Technically the requirement still exists in theory.
In practice however with loft insulation and double glazing the heating pipes in a house are not expected to freeze so they are not fitted any more.
When I was very small my Grandmother had a coke ( whats that? ) boiler in her kitchen with one of those PRVs which was all crusted with lime and I was always facinated by it.
That was directly heating the hot water cylinder upstairs by gravity!
I went round the house a few years ago as its still owned by the same people who bought it after my grandfather died and my grandmother emigrated to Australia. Now it has a Vaillant combi and central heating!
Tony
In practice however with loft insulation and double glazing the heating pipes in a house are not expected to freeze so they are not fitted any more.
When I was very small my Grandmother had a coke ( whats that? ) boiler in her kitchen with one of those PRVs which was all crusted with lime and I was always facinated by it.
That was directly heating the hot water cylinder upstairs by gravity!
I went round the house a few years ago as its still owned by the same people who bought it after my grandfather died and my grandmother emigrated to Australia. Now it has a Vaillant combi and central heating!
Tony
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We still use PRVs, but they are now preset to 3 Bar and have discharge pipes to outside (very sensible). The old safety valves were only a last resort if all else failed so I guess it didn't matter too much where they discharged.
Them old boilers didn't usually have "high limit" stats, which as you will know, are a requirement for a sealed system.
So with a modern boiler (with a HLS) you either have an open vent or a prv as well, so two safety devices already.
So with a modern boiler (with a HLS) you either have an open vent or a prv as well, so two safety devices already.
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