Tank vs Tankless Water Heater in Lake Stevens, WA

Tank vs tankless: the honest comparison

No hype here — neither type wins on every dimension. Here is how they stack up for a typical Lake Stevens home:

Scope depends on unit size, gas or electrical upgrades, venting, and code requirements — confirmed with a written quote before work begins.

How does each type actually work?

A tank heater is simple: a 40- or 50-gallon insulated steel tank holds hot water around the clock, reheating as you draw from it. You pay for standby heat loss — energy spent keeping water hot while nobody is home — but the design is proven, parts are cheap, and almost any plumber can service one.

A tankless unit has no tank. When you open a hot tap, water flows through a heat exchanger and a powerful gas burner (or electric elements) heats it on the spot. Nothing is stored, so nothing sits cooling in a tank all day. The tradeoff is power: a tankless gas unit can draw 150,000–200,000 BTU when firing, several times what a tank heater needs. That is why the install is more involved — and more expensive.

What makes tankless installation more complex?

Three things, and they are the reason tankless quotes surprise people. First, gas line sizing: many Lake Stevens homes have a gas line sized for a tank heater's modest appetite, and a tankless unit often needs a larger line run from the meter — sometimes through finished walls. Second, venting: tankless units need dedicated sealed venting (usually through a side wall or roof), which the old tank's vent may not satisfy. Third, electrical: even gas tankless units need a 120V outlet for the controls and freeze protection.

None of this is a dealbreaker — it is routine work for a licensed plumber — but it is real labor and real material, and it is why a tankless install costs two to three times a tank swap. Permits and inspection apply to both. A reputable installer sizes the gas line, plans the vent route, and quotes the whole job in writing before starting, so there are no mid-job surprises.

Does Lake Stevens water favor one type?

Slightly, and in tankless's favor. Tankless heat exchangers are sensitive to scale: hard water coats the narrow passages with minerals, cutting efficiency and eventually killing the unit — which is why hard-water regions need annual descaling. Lake Stevens PUD water is soft at about 73 ppm, so scale builds up far more slowly here. That does not eliminate maintenance — an annual service visit is still smart — but it removes the biggest tankless headache. Tank heaters benefit from soft water too, with slower sediment accumulation, but the advantage is more pronounced for tankless. Read more in our Lake Stevens water quality guide.

Which should your household choose?

Choose a tank if: you want the lowest installed price, your household's hot water use fits a 40–50 gallon tank (typical for 1–4 people with normal shower habits), or you plan to sell within a few years and will not recoup the tankless premium. Most Lake Stevens homes fall here, and there is nothing wrong with it.

Choose tankless if: you regularly run out of hot water (large family, back-to-back showers, big soaking tub), you are tight on space and want the garage or closet footprint back, or you plan to stay in the home long enough for the longer lifespan and lower operating cost to pay back the install premium. Size the unit for your peak simultaneous demand — two showers plus a dishwasher on a cold January morning — not your average day. Undersizing is the most common and most regretted tankless mistake.

Either way, get the sizing and the quote in writing before work starts. Our water heater installation page covers the full process, and when to replace your water heater helps you time the decision.

Last updated: October 2026

Deciding between tank and tankless? Contact Eby Plumbing — we will size both options for your household, check your gas line and venting, and give you written quotes for each so you can compare honestly.