Thanks for all your responses. We went back over there yesterday and checked
the water meter. The dial was spinning even after we made sure everything
was shut off. Then we shut off the supply valve to the water heater and the
water meter quit spinning. We left the valve off for a while and when we did
turn it on there was hot water. This tells me there is an under slab leak in
the hot water pipe.
We used an inferred thermometer to test the temperature of the floor near
the kitchen sink and in the bath rooms while the water heater had pressure
and when it did not have any pressure to see if there was any difference
and found none. This was done over a few hours, but still no temperature
difference in the floor.
Any hints on finding under slab leaks?
Additionally, if you have the time, leaving the WH / water off for a
while and turning down the temp in the house to allow the floor and
ground below to cool down should give you a more detectable temperature
differential when you turn on the water / WH again.
Jackhammer comes to mind. Or, route the pipe some other path.
Most non contact thermometers are "infared" which is a type of light. You
might know that already, but you inferred from your writing that you aren't
aware of that spelling.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.