linnrg
Sawhorse
ICE - if you have recirculated hot water systems the expansion tank should be installed, I wonder sometimes if the contractors bother to study the principles/logic behind some of the code language. Here in cold country the rule that is interpreted that a T&P must go to the exterior is ignored with approval.
On a past commercial project I found a water heater installed in a closet where the T&P was dripping to one of those little 1/8 hp condensate capture pump and a small hose to a drain receptor Everything in that closet was covered by layers of dust. The leaking T&P had been sending wasted hot water to the sanitary for years. Because the (Outside of the building sewer) line had a sag in it and was shallow when the leak was fixed by an expansion tank properly installed (and T&P replaced) on that circulated hot water line the building sewer froze up! The previous tenants had moved out they were medical offices - needles to say the new tenants pay somewhat less to the gas utility. The building owner had at least saved from having to dig up his sagging sewer line for years!
On a past commercial project I found a water heater installed in a closet where the T&P was dripping to one of those little 1/8 hp condensate capture pump and a small hose to a drain receptor Everything in that closet was covered by layers of dust. The leaking T&P had been sending wasted hot water to the sanitary for years. Because the (Outside of the building sewer) line had a sag in it and was shallow when the leak was fixed by an expansion tank properly installed (and T&P replaced) on that circulated hot water line the building sewer froze up! The previous tenants had moved out they were medical offices - needles to say the new tenants pay somewhat less to the gas utility. The building owner had at least saved from having to dig up his sagging sewer line for years!