WATER HEATERS
How to Estimate a Tankless Water Heater Installation
Contractor method for estimating tankless water heater installation by fuel and options.
Tankless installs fail on the venting and the gas line. The unit has a known price; the venting, the gas line and the electrical are where the quote grows.
THE SHORT ANSWER
How do you estimate a tankless install?
Choose the fuel, price the unit and labor, then add venting (~$600) and gas line (~$800). A gas unit at $1,400 with $800 labor, venting and gas line runs about $3,600.
Choose the fuel
Electric units are simpler and suit low demand; gas units need venting and a gas line. Confirm the fuel and the existing infrastructure.
- Confirm electric vs gas
- Check the existing gas line size
- Check the electrical panel capacity
- Note the venting requirement
Price the unit and labor
An electric unit runs ~$1,400 and gas ~$1,800. Labor adds ~$800 for a standard install.
Add venting and gas line
Venting adds ~$600 and a gas line ~$800 for a gas model. Use the Tankless Water Heater Installation Cost Calculator to build the quote.
Check the total
Your total should land within 10% of the calculator output before markup. A full tankless install runs $1,400-$5,400.