Tankless Water Heater Installation
Installation of gas or electric tankless water heaters for continuous, on-demand hot water.
Overview
Tankless water heaters heat water on demand rather than storing a large volume in a tank — meaning continuous hot water and, for many households, meaningful long-term energy savings and decades of service life versus a traditional tank.
Installation is more involved than a like-for-like tank swap: gas units typically require larger-diameter gas lines and updated venting, while electric units may need an upgraded electrical circuit. A licensed specialist can assess your home’s existing infrastructure and handle any required upgrades.
What This Service Typically Includes
- Household hot water demand assessment and unit sizing (measured in GPM)
- Gas line and venting upgrades for gas tankless units
- Electrical circuit assessment and upgrades for electric tankless units
- Removal of the old tank unit if converting from tank to tankless
- Water quality assessment (hard water can affect tankless unit lifespan)
Warning Signs to Watch For
- Household frequently runs out of hot water with a tank system
- Wanting to reclaim floor space currently used by a tank
- Planning a long-term home investment (tankless units can last 15-20+ years)
- Rising energy bills from an aging, inefficient tank unit
- Building or renovating and want on-demand hot water from the start
How This Service Works
1. Hot water demand and GPM calculation
Unlike a tank swap, tankless sizing is based on flow rate (gallons per minute) needed for simultaneous use — showers, laundry, dishwasher — not just storage volume. The specialist calculates your household’s peak demand to recommend the right unit size.
2. Infrastructure assessment
Gas tankless units typically need a larger-diameter gas line than a tank unit and updated venting rated for the unit’s BTU output. Electric tankless units often need a dedicated high-amperage circuit. This step determines what upgrades your home actually needs versus what’s already in place.
3. Old tank removal (if converting)
For households switching from tank to tankless, the old tank is drained and removed, freeing up the floor space it occupied — often reclaimed as storage or utility space.
4. Wall-mount installation and line upgrades
The tankless unit is wall-mounted, and any required gas line, venting, or electrical upgrades identified in step 2 are completed alongside the water line connections.
5. Water quality check and startup
Because hard water scale is the leading cause of reduced tankless lifespan, the specialist checks local water hardness and may recommend a scale-reducing filter before running the unit through its startup and temperature calibration.
What Affects the Cost
Gas line diameter and venting upgrades
If your existing gas line or venting doesn’t meet the new unit’s requirements, upgrading these adds materials and labor beyond the unit and mounting itself.
Electrical circuit requirements (electric units)
Electric tankless units often draw significantly more amperage than a standard household circuit provides, so a dedicated circuit or panel upgrade may be needed.
Converting from tank vs. new construction
Removing and disposing of an existing tank adds a step that isn’t needed when installing tankless in new construction or a first-time install.
Unit GPM rating and brand
Higher-flow-rate units built for larger households with simultaneous hot water use cost more than smaller single-bathroom-rated units.
Water hardness in your area
Hard water areas may benefit from an added scale-reducing filter at install time, which is an optional add-on some households choose to protect the unit long-term.
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Frequently Asked Questions
Is a tankless water heater worth the higher upfront installation cost?
For many households, yes — while installation costs more upfront than a tank replacement, tankless units typically last significantly longer and can lower monthly energy costs, especially in households with high hot water demand.
Can I convert from a tank to tankless without major renovation?
In most cases yes, though gas units may require larger gas line diameter and updated venting, and electric units may need a dedicated circuit upgrade. A specialist can assess your specific setup.
Do tankless water heaters need more maintenance than tank units?
Tankless units benefit from periodic descaling, especially in hard water areas, to maintain efficiency and prevent mineral buildup inside the heat exchanger.
Helpful Guides for Tankless Installation
What Size Water Heater Do I Need? A Sizing Guide by Household
Water heater sizing depends on household size, peak-hour usage, and fuel type. Use this guide to estimate the right tank capacity or tankless flow rate before you buy.
Read guide