US calculator
Tankless Water Heater Cost Calculator
Estimate installed US tankless or on-demand water-heater costs by required flow rate, system demand, fuel, technology, and installation scope.
How this estimate is calculated
A standard whole-house system allowance is combined with a modest flow-rate component calibrated to the reviewed installed project range at roughly 6 GPM. The full project range is not multiplied by GPM. System size establishes the project class, fuel and technology adjust the installed subtotal, and conversion or infrastructure work remains a fixed project allowance.
This is a planning estimate, not a contractor quote. Actual contractor quotes vary by location, specification, site conditions, labour, and project requirements.
Useful cost information
Planning assumptions
- This estimates tankless or on-demand hot-water systems, not storage-tank replacement.
- The default represents a normal whole-house system near 6 GPM.
- Tax credits, rebates, finance costs, and operating savings are not deducted.
Data sources & methodology
Angi — How Much Does a Tankless Water Heater Cost? [2026 Data], updated August 2026
Last reviewed: 2026-09
Helpful guides
Water Heater Replacement Cost Guide: Tank Size, Fuel Type and Installation
Conventional replacement cost depends on capacity, equipment type, existing connections, location, access, utility and venting work, approvals, and disposal.
Repair or Replace a Water Heater? Age, Warning Signs and Cost Comparison
Age and warning signs can justify evaluation, but repair or replacement should follow a professional diagnosis and a like-for-like cost comparison.
Tankless Water Heater Cost Guide: Equipment, Installation and Upgrades
Tankless project cost depends on demand and equipment, but conversion scope—electrical, gas, venting, plumbing, location, and removal—can drive the budget.
Tankless vs Tank Water Heater Cost: Upfront Price, Energy Use and Lifespan
Tankless and tank systems trade storage and recovery for flow capacity and infrastructure; the better fit depends on the household and complete installed scope.