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Old 03-17-2010, 11:39 PM   #1
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Tankless Hot Water Heater


I used to hear that tankless hot water heaters can't provide the same amount of hot water that a tank can provide for larger homes (e.g 4 BR, 3.5 BA). Has that now changed?

Here's an example of a Rinnai tankless model that supposedly can put out the equivalent of six 40 gal hot water heaters in one hour.

Also, they supposedly are good for 25 years.

http://www.dontdig.com/tanklessheating.php?animation=1

How much would one cost installed?

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Old 03-18-2010, 10:24 AM   #2
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Tankless Hot Water Heater


They are based on a rate of flow at a certain delta T which depends on your incoming water temperature. You will essentially be feeding an entire house through a 1/2" heat exchanger coil.

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Old 03-19-2010, 10:00 PM   #3
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Tankless Hot Water Heater


I'll bet you are looking at over $3000 installed. I put one in my self, it will supply 2 things using water at once. I bought a refurb unit and it was almost $800 + chimney (stainless steel) and electrical. I spent $1500 as a DIY project. You can buy a lot of water heaters for $3000...
Having said that I love having an endless supply of hot water and I would do it again.
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Old 03-19-2010, 10:27 PM   #4
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Tankless Hot Water Heater


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Originally Posted by UFoPilot View Post
I'll bet you are looking at over $3000 installed. I put one in my self, it will supply 2 things using water at once. I bought a refurb unit and it was almost $800 + chimney (stainless steel) and electrical. I spent $1500 as a DIY project. You can buy a lot of water heaters for $3000...
Having said that I love having an endless supply of hot water and I would do it again.
How long will it take you to make up for the cost savings in gas?
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Old 03-19-2010, 11:21 PM   #5
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Tankless Hot Water Heater


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How long will it take you to make up for the cost savings in gas?
I probably save about $500 a year in propane. It will pay for itself but it will take a long time.
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Old 03-20-2010, 06:38 AM   #6
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Tankless Hot Water Heater


Gas tankless water heaters will supply continuous hot water as long as you don't exceed their GPM flow rate.

How much you will save depends on how much your hot water demand is.

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