Tankless water heaters in Seattle
A tankless water heater heats water only when a tap opens, so you never run out and never pay to keep a tank hot. We size, install, vent and maintain condensing tankless heaters across Seattle, with the gas line, the permit and the inspection handled by us.
Why Seattle homes switch to tankless
The photo is one of ours: a condensing tankless unit on a plywood backer, with new copper supplies, a gas flex connector, PVC venting and a condensate pump. It replaced a 50-gallon tank that took up a closet.
Signs it is time
- The shower goes coldA tank runs out. A properly sized tankless unit does not, however long the morning rotation.
- The tank is over ten years oldMost tank heaters fail between 8 and 12 years. Replacing it with tankless means the next replacement is 20 years away, not 10.
- You want the floor spaceA tankless unit hangs on the wall and is roughly the size of a carry-on bag. In a Ballard townhouse or a Capitol Hill condo, that closet matters.
- Your gas bill is higher than it should beA tank reheats itself all day. Tankless heats only what you use, which is why condensing units carry high efficiency ratings.
- A remodel is adding a bathroomAdding a bathroom to a 40-gallon tank rarely works. Tankless sizing is by flow, so it grows with the house.
What a tankless installation involves
We start by sizing the unit to your home: how many bathrooms, the fixtures that run at once, and Seattle’s cold incoming water temperature in winter, which is what decides the flow rate you really need.
Then the mechanical work: the gas line is usually upsized, because a tankless burner draws several times what a tank does; new venting is run outside, with condensate drained to a safe point; water connections, isolation valves and a service kit are fitted so the unit can be flushed every year.
Gas and water heater work in Seattle is permitted and inspected. We pull the permit, meet the inspector and give you the paperwork.
Why Queen Plumbing for tankless
Tankless heaters are one of our specialties, and the difference between a good install and a bad one is in the gas sizing, the venting and the isolation valves, the parts you cannot see. We do those properly because we are the ones who come back to service it.
Free estimate, written. Licensed, bonded and insured. 100% satisfaction guaranteed, with the manufacturer warranty on the unit.
Tankless, in detail
- Tankless installation Sizing, gas, venting and the permit, step by step.
- Repair and maintenance Annual flushing, descaling and the faults we fix most.
- Tank to tankless conversion What changes when a tank comes out and a tankless goes in.
Licensed, local, and on the record
- Licensed Bonded and insured in Washington
- Founder 15+ yrs in the plumbing trade
- Always Free estimates
- Available Same-day service
- Our promise 100% satisfaction guaranteed
Tankless water heater questions
How long does a tankless water heater last?
Around 20 years with annual flushing, roughly twice a tank. Seattle’s soft water helps, because scale builds slowly here.
Do tankless water heaters need maintenance?
Yes. An annual flush to clear mineral deposits, a check of the burner, venting, water flow and pressure, and a test of the safety controls. We fit isolation valves at install so the flush takes under an hour. Repair and maintenance →
Will my existing gas line work?
Often not as-is. A tankless burner needs more gas than a tank, so the line is usually upsized from the meter. We check the whole gas system during the estimate and include any gas work in the written price. Gas line plumbing →
Can a tankless heater run two showers at once?
A correctly sized one can. Sizing is by flow rate against the temperature rise needed, and Seattle’s cold winter water is the number we design to, not a summer average.
Is a permit required in Seattle?
Yes, for the water heater and for the gas work. We pull it and arrange the inspection.
Get a tankless estimate
Tell us how many bathrooms you have and where the current heater sits. We will size the unit, check the gas and give you a written price. Free, no obligation.
Serving Seattle, Shoreline, Bellevue and Mercer Island.