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Boy, I would go with the tankless. I just put on in my home after checking out all the otions. I don't think anything beats a tankless. Other than than what Sam said about going solar
Philip Anderson
HDR Remodeling Berkeley Ca
Your question is a technical question. We would suggest that you go to our website (http://www.benningtonbuilders.com), to our Vendor Page and contact Plumbing Parts Plus who will be able to answer your question.
Go Solar!
Tankless water heaters are great but they typically cost two to five times more to put one in a house that wasn't built for it. They frequently require gas and venting upgrades beyond what was installed for the tank. Then there is the need to flush and descale the tankless and perform maintenance every 500 hours of use. (That can vary according to how hard your water is) That is typically once a year for a family of 4-5. Even the best tankless water heaters are only able to increase the water temperature by 40 degrees at 12 gallons per minute. I love tankless but they come with a much higher cost and maintenance. Be prepared for all that or put in a Rheem Pro grade 50 gallon gas heater. For value and performance I am a fan of the PRO+G50-40N RH62