Basic
$1,667 – $4,167 each
Non-condensing whole-house gas tankless unit with stainless steel venting, isolation valves, gas connection, old tank removed

Photo: Behrat · CC BY-SA 3.0 · Source
Install one whole-house natural gas tankless water heater including unit, venting, gas line connection and tank removal.
Gas Tankless Water Heater in Portland, Maine typically costs $1,961 to $4,903 each as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Prices in Portland are 1.0% lower than the national average for gas tankless water heater.
National average: $2,000 – $5,000 each
$1,667 – $4,167 each
Non-condensing whole-house gas tankless unit with stainless steel venting, isolation valves, gas connection, old tank removed
$1,961 – $4,903 each
Condensing whole-house gas tankless unit with PVC venting, condensate neutralizer, isolation valve kit, old tank removed
$2,451 – $6,128 each
Condensing gas tankless unit with built-in recirculation pump and Wi-Fi control, PVC venting, neutralizer, isolation valves
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $873 – $2,183 | each |
| Labor | labor | $700 – $1,750 | each |
| Supplies & Other | supplies | $233 – $582 | each |
| Equipment & Disposal | equipment | $155 – $388 | each |
Two white wall-mounted gas tankless water heaters with pipe runs on a brick wall
Photo: Dinkun Chen · CC BY-SA 4.0 · Source
Find a pro to do thisConnect with local gas tankless water heater contractors in Portland for personalized quotes based on your specific project.