Recently had a remodel done on a house. The water heater was replaced and it appears that the pressure relief drain tube is going to be connected directly to a drain pipe. I always thought this had to be opened air where the drain can be observed. My concern is that if this drain pipe got clogged it wouldn't be noticed right away and the pressure could build up in the water heater with no way out.
Is this ok for them to do that? Or am I right in my assumptions.
Is this ok for them to do that? Or am I right in my assumptions.