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Old 02-24-2007, 08:18 AM   #1
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Installing a tankless water heater ?

I am installing a tankless water heater next to my 50 gal. hot water tank. I am wanting to to keep the 50 gal. heater hooked up but out of service just incase the tankless ever stops working then I would just swap over to the tank heater. Can I just install shut off valves to the tank heater ( both lines at the tank ), and T off of those lines to my tankless , then use the copper flex lines to the new unit ? Want to do this to a standard plumbing code , can a shut off valve be installed on the hot side line of a water heater ? thanks


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Old 02-24-2007, 03:39 PM   #2
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Yes you can, install the shutoffs in away that will allow you to bypass said heater.


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Old 02-26-2007, 07:48 AM   #3
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Leave the water heater in place and place the tankless in series after the old WH. The old WH will act as a tempering tank and prewarm the water going to the tankless. You could install a bypass on the old WH if you are worried about a way to isolate it in case of leak or tank failure.
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Old 02-26-2007, 07:26 PM   #4
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I have seen a tankless installed in the line after the tank heater, and no bypass...the tank heater just turned off.....I would go the bypass...but I suppose a tank heater would probably never develope a leak if never heated, and turning it back on would be as simple as turning the gas valve back on and lighting the pilot.
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