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Old 03-24-2009, 11:10 AM   #1
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Tankless water heater proper pipe size?


Hi all,

My tankless water heater has 1/2" gas and water lines going into it. A plumber tells me that this type of heaters should have 3/4" lines for water and gas. Is this true?. Will it make a big difference for the water heater to go from 1/2" to 3/4" specially with the gas line?

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Old 03-24-2009, 03:36 PM   #2
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Tankless water heater proper pipe size?


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Hi all,

My tankless water heater has 1/2" gas and water lines going into it. A plumber tells me that this type of heaters should have 3/4" lines for water and gas. Is this true?. Will it make a big difference for the water heater to go from 1/2" to 3/4" specially with the gas line?


That plumber has seen the job. I haven't . He is probably correct

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Old 03-24-2009, 03:58 PM   #3
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Tankless water heater proper pipe size?


What size of fittings are on the heater. If it has 3/4" fitting that have been reduced down to 1/2 then he is probably correct. Or this could be a smaller unit than he is used to seeing that only needs the 1/2 inch.
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Old 04-06-2009, 09:59 AM   #4
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Tankless water heater proper pipe size?


Read the installation manual... it will have the specific requirements. Depends on brand, size, gallons/minute, etc..
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Old 04-06-2009, 02:52 PM   #5
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Tankless water heater proper pipe size?


The pipe size is based on the gas demand. MOST tankless units' demand is high enough to warrant 3/4" gaslines. There is no one-size-fits-all answer...It totally depends on the demand as well as the length of the pipe.
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Old 04-06-2009, 03:28 PM   #6
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Tankless water heater proper pipe size?


Quote:
Originally Posted by gante View Post
Hi all,

My tankless water heater has 1/2" gas and water lines going into it. A plumber tells me that this type of heaters should have 3/4" lines for water and gas. Is this true?. Will it make a big difference for the water heater to go from 1/2" to 3/4" specially with the gas line?
Is it working now?

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