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Top-Rated Tankless water heater installers in Seattle - Updated Nov 2026

Avatar for Stream Water Heaters
Stream Water Heaters
5.0(
55
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Talk to the guy who is doing the job. Great communication. Fast friendly and reliable. New water heater had a defect. Returned and completed the whole install a second time. No extra fee!"
A 20-Year-old gas WH.
A 20-Year-old gas WH.
Preventative Gas Repl.
Preventative Gas Repl.
Non-Condensing Tankless W

+1

Response time4 hrs
Response rate100%
Recommended by11%of homeowners
Avatar for Stream Water Heaters
Stream Water Heaters
5.0(
56
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Emergency services offered

"My water heater died last week. I went on Home Advisor and received a number of calls. One from George at Stream Water Heaters. We discussed my problem. George requested Photos of the heater and the area around the heater. Within 30mins I received an estimate. The price was totally reasonable for equipment and install. The water heater from a well known company and carried a better than good warranty. I received an install time of 6pm next day. The team remved the old water heater, replaced an obsolete valve, and installed the new water heater. I had numerous questions. All my questions were answered in the most courteous manner. The professionalism, expertise, and timeliness of George's Team were exceptional. Highly recommend this company."
New
New 3
New 2
New Setup 2
New setup

+8

Response time5 hrs
Response rate100%
4 neighbors recently requested a quote
Avatar for Day & Nite Plumbing & Heating, Inc.
Day & Nite Plumbing & Heating, Inc.
4.3(
225
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 1954

Emergency services offered

Warranties offered

"Rob came out to review our existing system and helped us figure out what kind and brand of heat pump would work best with our system. He was very patient and informative, and answered all our questions without any pressure or up-sells (we had quotes from five providers). We signed the contract and payed our deposit in June 2021, but unfortunately global supply chain issues delayed the parts being received. Day & Nite were communicative of the issue and offered several alternatives, including a refund of the deposit. We opted to wait for the parts. It took four months, but the techs (lead by Jeff B) were fantastic and very accommodating in how we wanted piping and wiring routed. We are very pleased with how it's turned out and loved working with a local (and family owned!) company! Our gas water heater is due for replacement soon, and we'll be coming back to Day & Nite for that!"
Outdoor Ductless Unit
Indoor Ductless Unit
Outdoor Ductless lineset and Unit
Pump System
1 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for SeaTown Electric Heating and Air
SeaTown Electric Heating and Air
4.7(
1,638
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Excellent experience with Jacob and Blaine from Seatown. They piped a gas line over to the tankless water heater and installed the heater. They removed the old heater and cleaned up the area. The quality of the work was very high. Both Jacob and Blaine were very personable and polite. We have already booked Seatown to upgrade our electrical panel and replace our old knob and tube wiring and sockets. Highly recommend Seatown."
Seattle's Rewire Specialists
Generator
Tesla Chargers
Knob and Tube Removal
Ductless Install

+26

Response time1 day
3 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Harts Plumbers, Electricians, & HVAC Technicians
Harts Plumbers, Electricians, & HVAC Technicians
4.6(
1,471
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Emergency services offered

Warranties offered

"My technician arrived at 9:00 am and did not leave my home until 6:00 pm. He installed a new water heater, removed my old water heater and fixed a hot water leak under my home. HE ASSURED ME THAT HE WOULD NOT LEAVE UNTIL ALL THE WORK WAS COMPLETE. HE WAS ABSOLUTELY GREAT!!!!!!!!! After the work was complete he performed a complete clean up of his work area. I will need some electrical work done in the future and HARTS will also be doing that work. They are professional, on time, and extremely knowledgeable on the work they perform. THEY HAVE MADE ME A LOYAL CUSTOMER FOR LIFE."
Prep Area
Waterfall Finished!
Excavation jobs and more!
 install grease trap for commercial kitchen
Delivery of Shoring

+334

39 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Private I Plumbing LLC
Private I Plumbing LLC
5.0(
26
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"Bad hot water heater. Came same day and gave bid which was lower than most. Completed work quickly the next day. Will hire him anytime I need plumbing work. very friendly and polite.A+++ in my book"
Water heater replacement
Water heater replacement
Water Heater install
Water Heater install
Water Heater install

+18

Response time6 hrs
Response rate100%
44 neighbors recently requested a quote
Avatar for Pipers Drain Repair LLC
Pipers Drain Repair LLC
4.8(
17
)
Tankless Water Heater - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

Pipers Drain Repair is a trusted provider of professional plumbing company services dedicated to keeping residential and commercial plumbing systems flowing efficiently. With a commitment to quality workmanship, fast response times, and exceptional customer service, Pipers Drain Repair specializes in diagnosing and resolving a wide range of plumbing issues, from leaking water line repairs to full house repipes. Using advanced equipment and proven techniques, the company delivers reliable, long-lasting solutions that help prevent costly future problems. Pipers Drain Repair takes pride in offering honest assessments, transparent pricing, and customized services tailored to each customer’s needs. Whether handling routine maintenance, drain inspections, hydro jetting, or complex repairs, the team is focused on delivering dependable results with minimal disruption. Known for professionalism, integrity, and attention to detail,

Liner Install
Liner Install
sewer camera inspection
Sink Drain Repair
Sink Drain Repair

+40

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