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Howdy-thinking about the purchase of a tankless heater-for domestic hot water, and sub floor heating. Anyone have any real experience with these units. Thank you Krome
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Dear Chrome,
I lived with a thankless water heater in Japan for 3 years -- they work great for domestic hot water needs (properly sized -- write for product info from dealers/manufacturers) and will save you a bucket of money over a conventional HAT. I doubt, however, that it would have sufficient output for an in-floor heating system without running all the time (if then), defeating the point of what is an on-demand system. If you have to have a boiler to support an in-floor system, then there's probably no point to a separate thankless heater. I should emphasize that this is a user-based opinion -- I'm not an HVAC expert.
*If you live in a region with high number of heating days and you already own a boiler, it is worth considering an indirect hotwater heater that utilizes the boiler as the heat source.There is another universe out there when it concerns indirects, with many claims and counterclaims.If I am not mistaken, all of these require zone controls with a circulator. Usually the domestic hotwater heating is given priority when there is simultaneous demand for heating.You have three different types.1. Domestic water piping goes through the boiler. (in many older systems with lots of failures.)2. Domestic water goes through a tank that has a coil through which the boiler water flows through to heat the water in the tank. Some jurisdictions require double wall tanks to guard against cross contamination.3. Domestic water flows through a coil that is inside a tank through which the boiler water flows through.Some use stainless steel, some use copper.There are many #2 choices.#3 types have some interesting advantages they tout and I have a brand selected (U.S.) but have yet to take the plunge.There are U.S. and European choices.For expert into, go to The Wall.I am not by any means an expert nor am I in the trade.
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Howdy-thinking about the purchase of a tankless heater-for domestic hot water, and sub floor heating. Anyone have any real experience with these units. Thank you Krome