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Old 08-31-2009, 01:32 PM   #1
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Location: Champlain, NY (NY, VT, QC Border)
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Tankless install question

I am about to install a tankless heater and have a question for the "Pros" in here as to what they would do in this instance.

It is a single family home, one bath, kitchen, D/W, etc.

The water heater (Rinnai) has the 3/4" supply and cold water inlet. However, the water service to the house is only 1/2". That being said, which of the following would you do:
-Call the municipality and try and get the service upsized?
-Run 1/2 make up water to the heater, then use a 3/4" x 1/2" red at the connection?
-Tee off the water main and increase size to 3/4" and run it to the heater.

It is worth noting that the house did have a back apartment, and that had it's own separate water heater, but again served by the same 1/2" service listed above. The apartment is not used now, nor will it be in the future.

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Old 08-31-2009, 02:09 PM   #2
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Tankless install question

Not sure what 3/4" main you are going to tee off from. Any connections should be made after the meter. I have seen this problem being asked about before, and it troubles me that some have said to just put a 1/2x3/4 adapter at the unit. The heater must need the volume of a 3/4" line to operate properly. If there was a warranty issue, this would violate the installation process. I would contact Rinnai and inquire about this since their units are not cheap.

If you have never made a mistake, you haven't done much.
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Old 08-31-2009, 02:13 PM   #3
Another DIY Zombie
Join Date: Jun 2008
Location: Champlain, NY (NY, VT, QC Border)
Posts: 281

Tankless install question

Thanks. I will contact Rinnai
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