Re: tankless hot water heater
I'm looking at the AO Smith Vertex HE water heater. One model is direct vent, 100kBTU and 96% efficient. The other uses a single pipe, is 75kBTU and 90% efficient.... and costs $500 less.
My current heater vents through the chimney without a liner, so I might as well go to a direct vent and use PVC, rather than spend $1000 on a new liner.
The Vertex units can be used with a circulator pump for hydronic heating systems. I'm actually tempted to put a couple radiators back into service for some zone heat in 1 room and a radiator that's mounted to the garage ceiling. Plus I might even switch to an airhandler and hydronic coil on my upstairs system that only needs 30k BTU"s of heating based on my load calculations.
I'm assuming however, that's I'm need a indirect tank since the boilers are cast iron.
1925 Two-Story Stucco Beaux Arts Neoclassical