Tankless water heater installation in the Rowlett, TX area ranges from $3,000 to $5,500 for a complete installation. Gas tankless units from brands like Rinnai and Navien typically cost $1,500 to $2,500 for the unit itself, with installation labor and materials adding $1,500 to $3,000 depending on the gas line and venting work required. Tankless repair services generally cost $200 to $600, and annual maintenance flush services run $150 to $250. For a detailed breakdown, see our guide on tankless installation cost breakdown.





