Is tankless water heater isolation valve sufficient for supply shutoff?

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CAUTION: Tankless water heaters generally require larger diameter gas supply lines, higher voltage power supply (if contemplating electric on-demand), dedicated - special stainless steel flue (known as Category II, III or IV) or larger diameter exhaust system. Please take these things into consideration before you decide to DIY.

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It is highly recommended that you use special union connector sets for the water supply which employ bypass capability. This will allow for simple, easy de-liming maintenance process in the future.

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Turn off main incoming water line to house.

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Disconnect supply line from old water heater. You will probably have some water left in the line even though your main has been shut off. Place a bucket underneath water bib to catch any spills.

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Disconnect heat source from old water heater as follows: for gas, (propane) make sure the supply valve is closed (this is usually...

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Video Transcript

RON HAZELTON:
You know, folks are always saying to me, “Ron, everything always goes so smoothly on the show, it's never like that when I take on a home improvement project.” Well, I can tell you, as a homeowner and a do it yourself guy, I'm not immune from the kind of surprises that are a part of just about any home improvement project.

As an example, I want to tell you about something that happened to me the other day. It all began when I came into the kitchen and turned on this faucet. Instead of a nice, smooth, bubbly stream of water, I got a lot of spitting and sputtering. I've seen this before. It almost always means debris is clogging the faucet aerator. So I unscrewed the device, disassembled it and sure enough, I found small white bits of material which I carefully picked out.

Then I washed the aerator thoroughly and replaced it. But a few days later, the sputtering was back. Then I went to take a shower up here in the master...

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Builders and utility companies are not in the business of wasting money, which means the main line will be as straight and as short as possible. This is a big help to you, since it will narrow your search. Walk out to the curb shut off, and look back at your house. Try to determine the straightest, shortest path between the curb shutoff and the house. Now you'll have a general idea of where the line enters the home.

In most cases utilities bury a tracer wire in the trench above utility lines, to make the lines are easier to locate later. If you call 811 (assuming you are in the US, though I believe this service is offered in other areas as well), they should be able to send somebody out to locate the line for you. This will show you the approximate path the line takes to the house.

Because it's a water line, it will likely enter your house below the frost line. If you can determine the frost depth in your area, you'll have a more targeted area to search.

It's...

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