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Mod Con Venting and Hot Water

CPyne Member Posts: 22

I've read how one of the advantages of a Mod/Con gas boiler is how you can vent them with just PVC. This may be a dumb question, but is a PVC vent a requirement? ie - If I have my old gas boiler replaced and the existing masonry chimney is still the most convenient place to vent, can I still use it with a mod/con?

Also, if I went with a new mod con boiler, could I eliminate my separate gas hot water heater and have the boiler provide the hot water as well? If this is possible, are there any advantages/disadvantages that anyone can share?



  • venting/dhw

    you could certainly utilize your existing chimney, but as a chase only, ie: run your pvc (or stainless in some boilers) vent up through the chimney with no other appliances venting into it.

    a mod/con is the most efficient way to make hot water with gas, some mod/cons can be set up to condense even while making DHW (see Vitodens). also you'd eliminate a 2nd appliance vent. the only disadvantage i can think of would be the initial higher install cost, but this would be totally overtaken in DHW savings in just a few years.
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