Notice the signs
Observe
Build a demand profile from occupants, fixture flow, overlapping uses, tubs, appliances, wait times, incoming water conditions, existing fuel or electrical capacity, vent route, drain, room air, and maintenance history.
Note 42
Place the condition before choosing the work
Protect the room
Safety line
Do not increase temperature to cover undersizing or ignore gas, vent, combustion-air, electrical, condensate, and structural limits. Hot-water settings require scald awareness and appropriate controls.
Material note
Local boundary
The current Cohasset permit office and licensed trades determine plumbing, gas, electrical, venting, and inspection steps. Rebates, rates, and product eligibility should be verified through their live programs before purchase.
Service flow
Written scope
Compare proposals at the complete system level: equipment, capacity basis, utilities, isolation and flush valves, expansion, recirculation, venting, condensate, permits, removal, commissioning, warranty labor, and maintenance cost.
Close the loop
Verification
Commissioning records should include final settings, measured temperature, flow under representative demand, error-free operation, leak checks, vent or power verification by the responsible trade, and occupant maintenance instructions.
Current primary source