Need test data rating on tankless gas water heaters

[Jon Austermuhl]

Gama has no ratings for tankless gas water heaters and no sources for test data exist. Can anyone post a home page or know a book showing the performance ratings, safety information including the cost of operation of Tankless Hot water heaters 99-98 using gas including parts availability for tankless heaters made in the US.only.What brand name tankless heaters would plumbers recommend in addition to considering a low cost to be used in a resi home for 2 people living in the home?Most importantly what tankless water heaters run quietly?What tankless heaters have a lifetime warranty made in the U.S ?

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