"Our tank failed overnight — Sam had a new one installed by 2pm the next day. Clean work, fair price, and walked us through the PSE rebate."
Tankless Specialists · Eastside WA
Tankless Water Heater Installation & Replacement
Endless hot water, half the footprint, and serious efficiency gains. Our certified team installs Rinnai, Navien, and Noritz units with code-perfect gas sizing, venting, and recirculation.
What neighbors say
Rated 4.9★ on Google
127+ verified reviews
"Switched from an old tank to a Rinnai tankless. The install is the cleanest plumbing work I've ever seen. Highly recommend."
"Got a heat pump water heater installed. Honest pricing, great communication, and our power bill dropped immediately."
"Annual service plan is the best money we spend on the house. They catch issues before they become emergencies."
Endless hot water
Heats on demand — back-to-back showers, dishwasher, and laundry without running out.
Lower energy bills
Up to 34% more efficient than a standard tank. No standby losses heating water 24/7.
20+ year lifespan
Nearly double a standard tank — with descaling included in our annual care plan.
Gas, propane & electric
We size and install the right fuel type for your home and panel capacity.
Code-perfect install
Proper venting, gas line upsize, condensate handling, and isolation valves every time.
Manufacturer-certified
Trained on Rinnai, Navien, and Noritz — your warranty stays intact.
Our install process
What to expect, start to finish.
No surprises, no upsells. Just a clean install and a system sized correctly for your household.
- 1Free in-home assessment
We measure flow demand, inspect gas line, vent path, and electrical.
- 2Flat-rate written quote
Two or three options at clear prices — you pick. No commissions.
- 3Permit & install in 1 day
Most replacements completed same-day with the city permit pulled.
- 4Walkthrough & warranty
We register your unit, walk you through controls, and book your first descale.
Recent installs
Real tankless jobs from Eastside homes
Clean, code-compliant installations: isolation valves, proper gas drip leg, condensate neutralization, and tidy venting.
Go deeper
The expert-level tankless guide
Sizing math, gas line & venting requirements, condensate neutralization, recirculation strategy, and the 7 install mistakes we routinely rip out and redo. Written by the technicians who do the work.
Read the technical guide →Local service area
Tankless water heater installation serving the Eastside of Washington
SJ Teddy Plumbing Contractors has installed, repaired, and serviced tankless water heaters across the Eastside of Washington for more than two decades. We are the local experts homeowners in Kirkland, Bellevue, Redmond, Bothell, and Woodinville call when they want endless hot water without sacrificing floor space or energy efficiency. From compact homes in downtown Kirkland to multi-bathroom estates in Sammamish and Issaquah, we size every tankless unit to your actual peak demand and verify the gas, venting, and electrical requirements of your property before we quote.
The Puget Sound region's cool groundwater — often in the mid-40s °F during winter — makes inlet temperature a critical sizing variable. An undersized tankless water heater in Bellevue or Redmond can leave you with lukewarm showers in January. Our process includes a flow-rate test, gas line capacity check using NFPA 54 sizing math, and a Category III or IV venting-path inspection. We only install Rinnai, Navien, and Noritz units that are properly sized for your home and family.
We pull every permit, register every warranty, and install isolation valves and condensate neutralization where required. If you are searching for "tankless water heater installation Kirkland," "tankless water heater replacement Bellevue," "endless hot water Redmond," or "tankless water heater Eastside WA," you have found the local plumbing team with the technical expertise and long service history to get it done right the first time. Contact us today for a free in-home assessment and a flat-rate written quote.
24/7 emergency water heater repair
Leaking tank, burst fitting, or no hot water at 2am? We answer around the clock and handle most Eastside emergencies same-day — repair or full replacement.
Service area
Proudly serving the Eastside, 30 miles out from Kirkland.
Stop by, send a note, or call us — we usually pick up on the first ring.
Office
339 Kirkland Ave, Suite EKirkland, WA 98033
Phone
(425) 399-2448Hours
Mon–Sat · 7am – 7pm · Emergency service availableCities we service
Kirkland, WABellevue, WARedmond, WABothell, WAWoodinville, WASammamish, WAKenmore, WAMercer Island, WAIssaquah, WALynnwood, WA
Ready for endless hot water?
Same-day quotes across Kirkland, Bellevue, Redmond, Bothell, and Woodinville.