Edited: October 29, 2025
Thinking about upgrading to a tankless water heater in Spokane? Mainstream Electric, Heating, Cooling, & Plumbing can guide you through the costs associated with this efficient home improvement. As a top provider of reliable plumbing services in Spokane since 2000, Mainstream offers expert installation, repair, and maintenance services for tankless water heaters.
What Influences Tankless Water Heater Installation Costs?
Several elements affect the cost of tankless water heater and installation in your Spokane home:
- Size and Capacity: The size and capacity of the heater depend on your household’s hot water needs. Larger units with higher flow rates typically cost more to install.
- Brand and Model: Prices vary by brand and model. Mainstream offers high-quality units from reputable brands like Bradford White and Navien to ensure satisfaction.
- Installation Complexity: Complexity can affect costs. Factors like unit location, gas line adjustments, and electrical upgrades may increase expenses.
- Labor Costs: Professional installation by a licensed plumber is crucial. Mainstream’s skilled technicians provide fair and precise service to ensure safe installation.
Replacement Tankless Water Heater Cost (Spokane & North Idaho)
Replacing an existing tankless unit usually costs between $3,000 and $5,000, while switching from a standard tank system averages $4,500 to $8,500 depending on fuel type, venting, and panel work.
- Like-for-Like Tankless Swap: This option involves updating your current tankless water heater with a new model, with costs ranging from $2,000 to $4,500. The process is straightforward, typically requiring only minor adjustments to existing connections.
- Tank-to-Tankless Conversion: For those looking to upgrade from a traditional tank system to a more efficient tankless model, this conversion costs between $3,500 and $7,000. It requires more extensive modifications, including new venting, gas line installation, and electrical upgrades
Typical Cost to Replace Water Heater with Tankless
| Project Type | Typical Price Range (Installed) |
|---|---|
| Like-for-like tankless replacement (no major changes) | $3,000 – $5,000 |
| Tank → tankless conversion | $4,500 – $8,500 |
| Electric tankless (new) | $3,500 – $7,500 (plus panel upgrade if needed) |
Note: Ranges reflect typical national estimates. Local factors like venting path, water hardness, and code compliance can shift pricing.
Tankless Water Heater Costs by Fuel Type
| Fuel Type | Typical Unit Cost | Typical Install Cost | Typical Total (Installed) |
|---|---|---|---|
| Electric | $500 – $1,500 | $1,000 – $3,000 | $1,500 – $4,500 |
| Natural Gas | $750 – $2,000 | $1,200 – $3,000 | $2,000 – $5,000 |
| Propane | $500 – $2,000 | $1,200 – $3,000 | $1,700 – $5,000 |
Note: Totals reflect equipment and labor. Add-ons vary by home layout, venting path, and code. Electric models may require service-panel upgrades; gas and propane units often need venting and gas line adjustments.
Additional Cost Considerations for Replacing a Water Heater
Switching to a tankless water heater can offer increased energy efficiency and a continuous supply of hot water. Beyond the base installation, some Spokane homes require extra work to meet local code or water-quality standards. Here’s what those add-ons usually cost:
| Item | Cost |
|---|---|
| Removal/Disposal | $100 – $500 |
| Isolation Valves Kit | $100 – $200 |
| Condensate Neutralizer | $150 – $300 |
| Vent Retrofit (if needed) | $500 – $1,500 |
| Permit/Inspection | $50 – $200 |
Local Considerations for Hard Water
Dealing with hard water in Spokane, WA, can be particularly challenging when maintaining a tankless water heater. Understanding the impact of hard water on your daily life and discovering effective solutions is crucial.
For those living in Spokane and North Idaho, performing annual system flushes is essential to managing hard water conditions, which range from 7 to 18 grains per gallon depending on your area. Residents serviced by Vera Water & Power might experience frequently hard water levels high as 18 grains per gallon. Regular maintenance is vital to protect heat exchangers, optimize water system performance, and reduce mineral buildup to prevent potential damage.
Consider joining the Mainstream Care Club for a hassle-free maintenance experience. Our team will ensure your tankless water heater receives timely annual flushes, and as a club member, you’ll benefit from 24/7 priority access to our skilled emergency plumbers. Protect your investment and keep your water heater running smoothly by enrolling in our Maintenance Plan today.
Experience the Benefits of Tankless Water Heaters
While the upfront investment in a tankless water heater might be higher than traditional systems, the benefits are significant:
- Energy Savings: Tankless systems heat water on demand, reducing energy waste and lowering utility costs.
- Space Efficiency: Without a bulky tank, these units save space in your home.
- Durability: Tankless systems often outlast traditional tanks, offering better long-term value.
- Unlimited Hot Water: Enjoy a continuous supply of hot water for your household.
Call Us for a Tankless Hot Water Heater Install Quote
For a detailed cost estimate for a tankless water heater in your Spokane home, contact Mainstream. Our team will evaluate your specific requirements and offer a comprehensive quote.
Schedule online or call — our licensed plumbers will provide a clear, upfront quote for your Spokane home. We’re available 24/7 for emergencies.
