Ditto what nightwing wrote.I have a pretty basic Beckett/Burnham 100,000 btu oil fired fhw boiler with a small heat exchang coil in the boiler like nightwing.I never run out of hot water and I don't have a storage tank at all.It's almost 100% on-demand hot water so I don't lose all that energy storing hot water in a tank.I had to change the coil after 8 years.Very simple and I did it myself.
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SIKSUKR
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