Converting to a tankless water heater can address limited hot-water capacity and free up space, but poor planning can lead to weak flow during simultaneous use, unexpected utility upgrades, and a higher final bill. Minneapolis homeowners need a company that can determine whether conversion fits the home, explain the full scope and price before work begins, and size the system for winter inlet temperatures and household demand.
Between September 1 and September 7, 2026, we evaluated six plumbing companies serving Minneapolis and the Twin Cities for their ability to assess, plan, install, and support a whole-home tankless water heater conversion. Unlike broader water-heater replacement rankings, this analysis focuses on conversion-specific sizing and retrofit work while also considering credentials, warranties, pricing practices, local experience, and customer feedback.
- Conversion Assessment & System Sizing (22%): Evidence that the company evaluates household demand, incoming water temperature, existing utilities, and suitable system capacity.
- Installation & Retrofit Capabilities (18%): Ability to manage venting, gas-line, electrical, plumbing, permitting, and code requirements associated with conversion.
- Online Review Score & Volume (16%): Published rating, review volume, and recurring customer feedback about service quality.
- Warranty & Satisfaction Protection (14%): Published workmanship guarantees, satisfaction policies, and manufacturer warranty support.
- Pricing & Estimate Transparency (12%): Availability of clear estimates, financing information, and explanations of conversion-related costs.
- Minneapolis Market Fit (10%): Local service coverage and experience with Minnesota’s climate, groundwater temperatures, housing stock, and code considerations.
- Experience & Professional Credentials (8%): Years in business and verifiable plumbing licenses, certifications, or specialized water-heater expertise.
The whole-home conversion lens favors companies that look beyond the water heater itself and account for flow demand, cold incoming water, gas capacity, venting, electrical needs, water quality, permits, and future maintenance. In the table below, four performance factors use 10-point scores, while warranty, pricing, and credentials use text descriptors drawn from public company information. The total score reflects the weighted calculation across all seven criteria.
The Best Companies for Tankless Water Heater Conversion in Minneapolis of 2026
| Rank | Company | Conversion Assessment & System Sizing | Installation & Retrofit Capabilities | Online Review Score & Volume | Warranty & Satisfaction Protection | Pricing & Estimate Transparency | Minneapolis Market Fit | Experience & Professional Credentials | Total Score |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Paul Bunyan Plumbing & Drains | 9.7 | 9.8 | 9.6 | 100% satisfaction; up to 2-year limited warranty | $$$; upfront estimates | 9.9 | Founded 2013; licensed plumbers and master-plumber depth | 9.54 |
| 2 | McQuillan Home Services | 9.5 | 9.5 | 9.2 | 100% satisfaction guarantee | Upfront estimates; financing available | 9.5 | Founded 1883; licensed and insured | 9.37 |
| 3 | Twin Cities Premier Plumbing | 9.5 | 9.0 | 9.6 | Published workmanship guarantee | $2,000-$4,500; flat-rate quotes | 9.5 | Founded 2022; licensed and insured | 8.94 |
| 4 | Genz-Ryan | 8.0 | 8.5 | 8.8 | Published lifetime guarantee | Quote required; financing available | 9.0 | Founded 1950; licensed and insured | 8.58 |
| 5 | Air Mechanical | 7.5 | 8.5 | 9.0 | Lifetime workmanship warranty | Free upfront estimates; financing available | 8.5 | Founded 1985; journeymen and masters | 8.43 |
| 6 | Dean’s Home Services | 7.5 | 7.5 | 8.0 | 100% satisfaction guarantee | Free installation estimates; financing available | 9.0 | Founded 1996; licensed technicians | 7.91 |
1) Paul Bunyan Plumbing & Drains, for whole-home conversion planning
Paul Bunyan uses a diagnostic-first process for tankless conversions. Its licensed plumbers evaluate household hot-water demand, plumbing condition, and available gas or electrical capacity before sizing the unit. After installation, the company tests gas and water pressure and checks system performance. That process directly addresses the problems that cause an undersized or poorly configured tankless system to disappoint after installation.
Paul Bunyan also combines tankless installation with general plumbing and water-quality service, which is relevant when mineral buildup or existing piping affects the project. Written upfront pricing, 24/7 availability, master-plumber depth, a 100% satisfaction commitment, and published warranty coverage support the top ranking. The company sits in a premium price tier, so homeowners should confirm equipment, permit fees, code upgrades, maintenance requirements, and labor coverage in the final proposal.
- Location: New Hope, Minnesota; serves Minneapolis and the Twin Cities
- Price Range: $$$; upfront estimates and financing are available
- Services Offered: Tankless assessment and installation, tank and tankless repair, maintenance, general plumbing, drains and sewers, and water-quality systems
- Year Founded: 2013
- Review Score: 4.9/5 average; the company reports more than 13,000 reviews across platforms
| Summary of Online Reviews |
| Reviewers describe Paul Bunyan technicians as “professional, knowledgeable, honest, and efficient” and praise “phenomenal service and communication.” Public feedback is strongly positive overall, though homeowners should still compare the complete conversion quote and warranty terms for their specific property. |
2) McQuillan Home Services, for complex gas retrofits
McQuillan publishes unusually specific guidance for tank-to-tankless conversions. Its process accounts for household demand, cold Minnesota inlet water, gas-line size, meter capacity, BTU input, venting type, electrical requirements, permits, and inspections. That scope makes McQuillan a strong option for older homes or projects where the existing utility setup cannot support a direct equipment swap.
Founded in 1883, McQuillan pairs long Twin Cities experience with licensed technicians, upfront pricing, financing, same-day scheduling, and a 100% satisfaction guarantee. Its public materials do not provide a standard installed conversion price, and some customer feedback mentions estimates changing after work began. Homeowners should request a written allowance for gas, venting, electrical, and permit work before approving the installation.
- Location: St. Paul, Minnesota; serves Minneapolis and the Twin Cities
- Price Range: Not publicly listed; upfront estimates and financing are available
- Services Offered: Tankless installation, repair and maintenance, gas and electric water heaters, plumbing, HVAC, drains, and electrical work
- Year Founded: 1883
- Review Score: 4.6/5 across 5,488 Google reviews reported by Trustindex
| Summary of Online Reviews |
| Reviewers frequently praise McQuillan’s “customer service”, knowledgeable technicians, and clear explanations. Some feedback reports estimates that changed after work began, so homeowners should ask the company to document allowances for gas, venting, electrical, and permit work before approving the conversion. |
3) Twin Cities Premier Plumbing, for transparent conversion estimates
Twin Cities Premier Plumbing gives Minneapolis homeowners one of the clearest public pictures of a tankless conversion. Its materials discuss gas-line sizing, venting, electrical setup, permits, hard-water maintenance, and the difference between a simple replacement and a full tank-to-tankless retrofit. The company estimates that many conversions take four to eight hours and publishes a typical installed range of $2,000 to $4,500, depending on the unit and required modifications.
The company is locally owned, uses flat-rate upfront pricing, and installs and services Rinnai and Navien systems across Minneapolis and nearby communities. Its 4.9-star rating and conversion-specific guidance support a high ranking, but the business began in 2022 and has a shorter service record than most companies in this comparison. Homeowners should also confirm the exact workmanship-warranty term and annual descaling plan in writing.
- Location: St. Louis Park, Minnesota; serves Minneapolis and the western Twin Cities
- Price Range: Approximately $2,000-$4,500 for a gas tankless installation, subject to site conditions
- Services Offered: Tankless installation, replacement, repair and maintenance, conventional water heaters, gas-line work, general plumbing, repiping, and water treatment
- Year Founded: 2022
- Review Score: 4.9/5 across more than 335 Google reviews reported by the company
| Summary of Online Reviews |
| Customers commonly describe Twin Cities Premier Plumbing as “honest, reliable and experienced” and praise its responsiveness. A smaller set of public reviews raises concerns about high costs or the scope of follow-up work, so buyers should compare the written conversion scope with at least one other bid. |
4) Genz-Ryan, for broad home-system support
Genz-Ryan installs and services tankless water heaters across Minneapolis-St. Paul and can also handle gas connections, electrical work, plumbing, heating, and cooling. That multi-trade scope is useful when a conversion requires a larger gas line, a new circuit, or related mechanical work. The company offers same-day service and installation, financing, and a published lifetime guarantee.
Founded in 1950, Genz-Ryan reports a 4.7-star Google rating across more than 6,400 reviews and has a long operating history in the Twin Cities. Its public tankless page confirms installation and service capability but gives less detail about cold-water sizing, venting design, permits, and installed pricing than the three companies above. Buyers should require a load calculation, an itemized retrofit plan, and written clarification of what the lifetime guarantee covers.
- Location: Burnsville, Minnesota; serves Minneapolis-St. Paul
- Price Range: Not publicly listed; financing is available
- Services Offered: Tankless installation, repair and maintenance, standard water heaters, gas connections, plumbing, electrical, heating, and cooling
- Year Founded: 1950
- Review Score: 4.7/5 across 6,477 Google reviews reported by the company
| Summary of Online Reviews |
| Reviewers often call Genz-Ryan technicians “friendly and prompt” and value fast scheduling. Other public feedback questions pricing or sales recommendations, so homeowners should ask for an itemized proposal and clarify what the lifetime guarantee covers. |
5) Air Mechanical, for coordinated utility upgrades
Air Mechanical installs and repairs gas and electric tankless water heaters and also provides gas-line, plumbing, and electrical work. Its field team includes licensed journeymen and master-level professionals, which gives the company the trade coverage needed for conversions involving more than the water heater itself. Free upfront estimates, financing, 24/7 availability, and published warranty protection add practical value for larger projects.
The company has operated from Ham Lake since 1985 and serves Minneapolis and the surrounding metro. Air Mechanical’s cross-discipline experience is useful when a plumber and electrician need to coordinate, but its public tankless information does not explain conversion sizing, venting, or permit handling in the same depth as the higher-ranked providers. Homeowners should ask for those items to be documented before comparing its proposal with plumbing-focused firms.
- Location: Ham Lake, Minnesota; serves Minneapolis and the Twin Cities
- Price Range: Not publicly listed; free upfront estimates and financing are available
- Services Offered: Tankless and conventional water heaters, gas-line installation, plumbing, electrical, HVAC, maintenance, and repair
- Year Founded: 1985
- Review Score: 4.8/5 from 1,587 verified Best Pick Reports reviews
| Summary of Online Reviews |
| Customers describe Air Mechanical technicians as “fast, knowledgeable and friendly” and praise thorough work, clear explanations, and clean job sites. Some third-party ratings vary by platform, so homeowners should review recent plumbing-specific feedback rather than relying only on the company-wide average. |
6) Dean’s Home Services, for Navien-focused installation
Dean’s installs, repairs, and maintains tankless water heaters in Minneapolis and identifies Navien as its preferred replacement brand. The company offers same-day scheduling, free estimates for installations and replacements, upfront pricing, financing assistance, licensed technicians, and a 100% satisfaction guarantee. Its broader plumbing and electrical services can support conversions that require work beyond the new unit.
Founded in 1996, Dean’s brings an established Twin Cities service operation, but its public tankless page does not detail gas-load calculations, winter inlet-water assumptions, venting routes, electrical upgrades, or permit handling. Review results also vary sharply by platform, with positive feedback for knowledgeable technicians and critical feedback about pricing or follow-up. A detailed written scope, model number, change-order policy, and recent tankless references are important before hiring.
- Location: Minneapolis, Minnesota; serves Minneapolis-St. Paul and surrounding communities
- Price Range: Not publicly listed; free replacement estimates and financing are available
- Services Offered: Navien tankless installation, tankless repair and maintenance, standard and heat-pump water heaters, plumbing, drains, electrical, heating, and cooling
- Year Founded: 1996
- Review Score: 4.6/5 from 3,974 verified Best Pick Reports reviews; ratings are lower on some other platforms
| Summary of Online Reviews |
| Positive reviewers describe Dean’s technicians as “knowledgeable, transparent, and attentive” and value same-day scheduling. Critical reviews cite high pricing or installation follow-up concerns, so buyers should confirm the final scope, equipment model, warranty, and change-order process in writing. |
Subranking Categories
We also broke down the top companies into three subcategories based on specialty.
Best Five for Complex Tank-to-Tankless Retrofits
| Company | Strength |
|---|---|
| Paul Bunyan Plumbing & Drains | Strong whole-home assessment, plumbing depth, water-quality support, and published sizing guidance |
| McQuillan Home Services | Detailed treatment of gas capacity, venting, electrical needs, permits, and inspections |
| Twin Cities Premier Plumbing | Conversion-specific guidance with public cost and timing information |
| Air Mechanical | Plumbing, gas-line, and electrical capabilities under one service company |
| Genz-Ryan | Broad home-service scope suited to projects involving multiple utilities |
Best Five for Established Review Depth
| Company | Review Volume |
|---|---|
| Paul Bunyan Plumbing & Drains | The largest published cross-platform review total in this comparison |
| Genz-Ryan | More than 6,400 Google reviews reported by the company |
| McQuillan Home Services | More than 5,400 Google reviews reported by Trustindex |
| Dean’s Home Services | Nearly 4,000 verified Best Pick Reports reviews, with more mixed results elsewhere |
| Air Mechanical | More than 1,500 verified Best Pick Reports reviews |
Best Five for Upfront Project Planning
| Company | Pricing & Planning |
|---|---|
| Paul Bunyan Plumbing & Drains | Clear sizing discussion, upfront pricing, maintenance guidance, and written warranty information |
| Twin Cities Premier Plumbing | Public conversion price range and detailed discussion of likely retrofit work |
| McQuillan Home Services | Strong technical planning information and written upfront-pricing policy |
| Air Mechanical | Free estimates with plumbing, gas, and electrical capabilities |
| Genz-Ryan | Financing and guarantee information are public, though conversion details require confirmation in the estimate |
A tankless conversion should begin with a home-specific assessment rather than an equipment recommendation alone. Ask each company to document peak hot-water demand, winter inlet-water assumptions, gas-meter and line capacity, venting, electrical needs, water treatment, permits, maintenance, warranty coverage, and the full installed price.