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I honestly don't know, because we still have many area's that don't have back flow preventers or check valves installed on the water service. When I come across a home that's like that, I always install a threaded tee plugged off for future use.
Here pertection from expansion is code because we are required to put a check valve on our municipal service line "because its not rated for hot water.. i hate the eexpansion tanks thou so i usually use apollo expansion ball valves their cheaper and you have to put a valve in anyway and customers dont question what they are.
That is one expensive valve!. I usually do a brass tee off water heater w/ 6" nipple and 90 for tank. I have had an inspector require expansion tanks here on 2.5 gallon under cabinet water heaters. Their reason was the code doesn't specify a minimum size of the heating vessel requiring one. I guess common sense doesn't play into it either.
yes , they have started enforcing them pretty strictly here. They are required by code here now that all new HW installs have one. Hey just more to mark up. Takes about 3 more min to install and you get to mark up the price. hey works for me.
Wise man said "Hot on the left, cold on the right, crap flows downhill, and checks come on Friday"