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Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 20929
Experience:  Licensed Master plumber with 40+ yrs. experience.
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I am trying to install 3 new tankless water boilers from old

Customer Question name is***** am trying to install 3 new tankless water boilers from old hot water tanks. How ever my plumber said it need to change bigger service line gas pipe, which it would be a lot more work. Is there any out there have lower btu tankless water boiler can do 2 bathroom in nyc
Submitted: 1 year ago.
Category: Plumbing
Expert:  Rick replied 1 year ago.

Unfortunately the answer to your question is no. Tankless heaters use a lot more gas (but in a shorter period of time) than tank type heaters. So they need larger capacity gas piping. That's one of the down sides that's seldom mentioned before folks purchase a tankless. There are other downsides to: ***** ***** /repair costs, quirky response to low flow situations to name a couple. When ALL costs are considered tankless heaters are no more cost effective than tank type heaters.

Customer: replied 1 year ago.
how about vessiman 100 this unit only use 91000 btu consider to other need.180000 btu
Expert:  Rick replied 1 year ago.

91k is still almost 3 times the input of a typical tank type heater so it would still probably require new piping. Also keep in mind the brand doesn't matter in this regard. If the tankless has a lower input it will have a lower hot water output. The one you mention is not likely to make for a happy user.