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infoiam 10-07-2008 10:29 PM

Installing a Tankless Water Heater
Recently my tank water heater went bad. I think I want to go tankless. The location where I want to place my tankless water heater is near my washing machine. The water heater that went bad is in a different part of the basement.

I want to cap the the water lines at the water heater that went bad.
I want to place a tee on the water lines going into the washer and connect to the tankless water heater.
Is this ok or do I have to bring the water lines from bad water tank over to the location where I am installing
the tankless water heater. Thank you

Marvin Gardens 10-07-2008 11:01 PM

You can bring the water from anywhere in the house you want to. Code is 3/4" but I have seen 1/2" feeds. Since tankless will not supply more than about 5-6 gallons per minute depending on delta T a 1/2" line will mostly do fine.

bryguy 10-16-2008 07:55 PM

I do agree with Marvin Gardens on being able to bring the water lines to the unit from any part of your home yet I would also be cautious about leaving a dead end water line handing in the air due to the stagnant water that will lie in them. I recommend at least removing these dead ends and installing couplings where the 3/4 or 1/2 TEE is located. Just to be safe....

bryguy 10-16-2008 09:40 PM

To put it simply the Delta T is nothing more than the temp rise the water needs to come up to. For example. If you consider the temp of the water supplied to your house, say, 41 on average and you would like a comfortable 120 degrees at the faucet than your Delta T is 79 degrees. Most units can handle this temp rise. consider the unit you are purchasing. You could speak with 10 different installers and receive 10 different opinions obviously. One thing that scares a lot of installers is that they don't like change. They find what works and stick with it. Actually now adays change is usually for the better. I say if you are going to be living in this location for a while than go for it. I've installed a lot of on demand units and have yet to here back from a customer. If installed correctly you'll LOVE IT...... Just a little plug for... Rinnai. Also you should think of actually how much do you use 5 to 6 gal per minute. that's 2 to 3 showers at a time. nobody takes baths anymore and if they do it's only one at a time. not only that but you actually need a 50 to 60 gal storage tank to make up that sort of hot water and not run out. Trust me I belive it's a great idea if you are going to occupy the house for a minnimum of 5 yrs.

gregsauls 11-10-2008 09:59 PM

The closer the tankless unit is to the point of use, ie shower, the quicker cold water is purged from the lines and hot water is flowing. Going to a tankless in our house increased the wait for hotwater in the shower by about 10 seconds. No biggie.

Love the Rannai though....

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