When I checked a garden faucet, it started running hot water after a while of cold water, what could be the cause?
The SUN!!!
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Possibly plumbed downstream of the WH?
Did the house have a hot water recirculation system installed?
I spoke with the home owner and he said this never happened, he waters the garden every morning and never had hot water coming out.
by the way, I checked it around 1pm
You should let us know where you’re located, and what the specifics of the plumbing system happen to be.
I’m in Winnipeg, Canada, and I checked all the plumbing systems and found nothing unusual.
Did it have a garden hose? If so, it was full of sun- heated water. Wait a little while and see if cold comes out.
If no hose was connected, then it’s plumbed to the water heater…
No other explanation
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Too many unknowns to guess anymore issues, David.
You were there, what else did you find?
Did the sillcock connect to plumbing in a basement?
Any work done recently, such as a shower valve or tempering valve?
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Since the pipes are hidden behind the drywall, I can’t see them. But the homeowner told me he did nothing recently.
no hose was connected, I guess its plumbed to the water heater but I confuse that the homeowner told me its never happened before.
Could be that the plumber hooked the hose bib up to the hot water.
Years ago, the general called me out around midnight to go look at “a problem” at an apartment complex that the company I was working for was doing the HVAC & plumbing on. When I pulled up, all I could see was steam coming from the sprinklers that were watering the fresh sod. One of the plumbers hooked the hose bib up to the hot water supply. Luckily it didn’t kill the sod.
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Something isn’t right. No one waters the garden every morning and then disconnects the hose when they are done each day.
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that’s why I confused, I’ve already put it in my report.
Here’s an easy check if you come across this again (doubtful). Go turn off the valve on the incoming side of the water heater. Then go back out and turn on the hose bib. If plumbed to the water heater, it should putter out quickly. Disclaimer: Don’t do this if the valve at the water heater is old and crusty looking, lol. Then don’t touch it!
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FYI, next time try to give us more info (basement, crawlspace, slab foundation, copper or PEX tubing, age of home, etc. etc.)
So far it’s dribs and drabs and confusing tidbits.
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And if the valve gets stuck or starts to leak? 
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Then you shouldn’t have touched it!
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And why I don’t… 
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