Tankless Water Heater Installation

Purpose

Installation procedure for tankless water heater systems.

Verify unit specs match the estimate and home demand requirements

Assess gas line sizing — tankless units require higher BTU capacity than tank heaters

Plan venting route — most tankless units require direct vent (intake and exhaust)

Protect the home with shoe covers and drop cloths throughout

Remove old equipment and prepare the installation location

Mount the unit per manufacturer specs — proper clearances and support

Run gas line (must be properly sized for BTU requirement), water lines, and condensate drain

Install venting with proper pitch (1/8 inch per foot toward unit for condensate drainage)

Secure vent hangers every 4 feet to prevent sagging

Connect condensate drain to approved drain point

Fill system and check all connections for leaks

Perform gas leak test on all connections

Power on and run through startup sequence per manufacturer

CO test at exhaust termination

Verify proper water temperature at fixtures

Set up recirculation system if included in the scope

Apply Spartan installation sticker

Gas line sizing is critical — undersized gas line will cause poor performance and error codes
Vent pitch matters — improper pitch causes condensate pooling and error codes (like Navien 110-01)
Condensate is acidic — route to an approved drain, not directly onto concrete or soil
Annual descaling maintenance should be recommended and scheduled
Customer education is important — explain how tankless differs from their old tank unit