Upstairs
A bathroom over the shop
Many upper floors became lofts or offices long after the building went up, so a newer bathroom often sits on an old ceiling. A seeping shower valve or a worn toilet seal shows up as a stain downstairs before anyone upstairs notices.
Leak detectionA long wait for hot water
When the water heater sits in a closet at the back of the building, or on another floor, the tap upstairs runs cold for a while. A smaller heater near the fixtures, or a wall-hung tankless unit, shortens that wait.
Tankless water heaters
