There have been numerous leaks in the copper domestic hot and cold water piping, resulting in property damage.
The soldered joints in the copper water piping were over fluxed. This has caused flux corrosion and leaks.
The copper water piping was not reamed at the tubing ends. This can cause internal erosion of the tubing and fittings.
The water heaters have no drain pan, as per manufacturer's installation instructions. This will likely cause water damage to property in garage.
The shut-off valves for the water supply are corroded and leaked and caused damage. The valves were not properly selected by the contractor for this service and are dezincing.
Certain high-efficiency water heater PVC flue vents are not insulated, as per manufacturer's installation instructions.
There is no insulation on the hydronic hot water supply and return piping that provides hot water heating to certain fan coils. California Title 24 requires this piping to be insulated.
Certain laundry washing machine indirect drains are not readily accessible and the water valves are not accessible. They are located behind the stacked washer/dryer.
Certain 3" PVC water heater flue vent penetrations are not properly fire rated through the all in violation of the building code. This occurs through certain units and in the electrical rooms.
Hot water takes over a minute to warm up in the bathrooms. One minute was used at the criteria even though most reasonable homeowners expect hot water in less than 30 seconds.