Understanding the Differences is Important.
When designing a condensing boiler or water heater system, one important consideration is what material should be used to vent the appliance. For some appliances, the Manufacture will only allow AL29-4C grade of stainless steel. But some Manufactures will also allow PVC and CPVC, under strict guidelines.
Let’s look at some questions and answers addressing Stainless Steel vs. PVC/CPVC
We’re pleased to announce updated clearances to combustibles for Saf-T Vent models CI Plus and EZ Seal per ULC-S636:
- Fully enclosed at 0” clearance to combustibles
- 3”-12” ID at a maximum flue temperature of 230°F (110°C)
- 14” ID and larger at a maximum flue temperature of 194°F (90°C)
This thermal performance competes directly with the thermal performance of plastic venting that is alternately used in the market place. However, with stainless steel venting, you’ll never have any pipe melting concern from over-firing boilers or unanticipated higher flue temps due to long term boiler efficiency loss. Plus, stainless steel venting has a Zero flame and smoke spread, while plastic venting needs to be fire wrapped within certain construction environments (i.e. above ceiling plenum air spaces).
Commercial size single wall EZ Seal is competitively priced against plastic venting, so why not go with the extra insurance and a 15 year warranty.