Indirects HWHeaters: tank-in-tank vs. coil-in-tank

Doug_3

I am looking at high quality versions of both types. The heat exchanger in the coil-in-tank model I'm looking at is stainless steel and the coil runs throughout the stainless steel tank (it isn't just a sitting at the bottom of the tank). The tank-in-tank model features a stainless tank of domestic surrounded by a bath of boiler water. Both models have similar specs. What's your opinion?

Mark Hunt

Tank in Tank


All I use!

Mark H

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nathan

indirect

mark why only tank in tank

Bob Bona_4

tank

in tank man myself. Not much pressure drop to worry about, lots of heating surface, scale resistant..

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Mark Hunt

I post too fast


I should have said I use Tank-in-Tank 90%+ of the time.

I do use Buderus LT series tanks when I am installing Buderus oil boilers.

As others have mentioned, the pressure drop across a tank-in-tank is less and there is a huge heat exchange surface.

Throw in stainless steel as an added bonus and it's a pretty easy decision for me!!

Mark H

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