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Brand new rennai tankless hot water heater installed on newly built home. Rl75e model need to purge for the first time

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  • Water Master
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Gas line I take it . You will need to purge from the outlet of the meter first to make sure service line and meter are clear of air . And then close to the heater make sure its well vented and no source of ignition soap test any joints you loosen .

Posted on Apr 25, 2017

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Posted on Jan 02, 2017

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How do you insulate a tankless water heater for winter


If you have tankless electric, it can simply be insulated... but tankless electric are seldom mounted outdoor.
Service bulletin says: "the only way of assuring protection is to completely remove the heater during those times the area may experience freezing temperatures.

There are tankless with built-in heater for exterior installation.
Check your manual, or add a comment with specific model number and maybe I can find the information.

Here's why they install tankless outdoors: Because tankless burn more fuel per gallon of hot water. This requires larger gas line and larger vent pipe than typical tank-type gas water heater that is usually installed indoors.
They install tankless outdoors, so there is no need for expensive vent pipe, and because there is ample incoming air to support combustion.
So if tankless does not have factory-installed internal heater, then the unit can freeze easily when the combustion draws in cold air.
Of course you can put heat-tapes on the pipes but the heat exchanger inside will quickly freeze during periods when hot water is not being used, and combustion is not taking place.

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Rheem Tankless Water Heater Selection and Installation Videos
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1 Answer

Need to turn on several different hot water sources to get my heater to fire up. My faucets are low flow, so for some reason the heater will not fire unless there is more demand. It is brand new out of...


When a tankless is installed, they are usually set up with a recirc. Theis keeps the water continuously heating to some degree.
When a tankless is installed into a home it has nothing to heat the water that is sitting in the pipe from its faucet to its heat source. Now as soon as you turn on the faucet, you have to let all that cold water run out until the newly heated water comes out from when you started the faucet.
You could measure the volume until heat and it will be pretty much the same every time for a given faucet.

The fact that your faucets are low flo is only part of the factor involving time it takes to get hot water. Another factor is volume. The diameter of your pipes makes a difference. You can remove the low flo restrictor from the faucet farthest away to speed up the process at least a little.

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