For most Washington County homes, a conventional tank water heater is the better value: it costs $1,800–$3,000 installed and handles typical family demand just fine. A tankless unit costs roughly $4,500–$7,500 installed but lasts 18–20 years instead of 10–12, never runs out of hot water, and cuts water-heating energy use about 25–30%. The right choice comes down to how long you plan to stay in the home, whether your gas line and venting can support tankless, and how much hot water your household actually uses at once.
What We Actually See in Tigard, Beaverton, and Hillsboro Homes
We replace water heaters year-round across Washington County, and the housing stock tells you a lot. The 1970s–90s split-levels and ranches in Tigard and Beaverton almost always have a 40- or 50-gallon gas tank sitting in the garage or a utility closet, often on a shallow drip pan with a flex connector that's seen better days. Newer construction in South Hillsboro, Sherwood, and parts of Tualatin is increasingly plumbed for tankless from day one — those homes already have the 3/4" gas line and exterior vent penetration, which is the expensive part.
That distinction matters more than the brochure specs. In our experience, converting an older Beaverton home from tank to tankless adds $1,500–$3,000 in gas line upsizing, venting, and electrical work before you've paid for the unit itself. If the home is already set up for it, the gap between tank and tankless narrows considerably.
Lifespan and Failure Patterns
Tank water heaters in this area typically fail at 10–14 years. The failure is almost always the same: the glass lining cracks, the steel tank corrodes from the inside, and one morning there's water across the garage floor. We get a spike of these calls every January when incoming water temperatures drop and tanks work harder.
Tankless units don't fail that way. They throw error codes — 11, 12, and 29 on Navien and Rinnai units are the ones we see most — and those are usually repairable. Heat exchangers, flow sensors, and igniters are all serviceable parts. We've worked on tankless units installed in Lake Oswego in the mid-2000s that are still running on their original heat exchanger because the homeowner kept up with descaling.
Hot Water Capacity: The Real Comparison
A 50-gallon gas tank delivers roughly 80–90 gallons in the first hour, then needs 30–45 minutes to recover. That's fine for two or three people. It's not fine for a family of five with back-to-back morning showers.
Tankless is rated by flow, not volume. In Oregon, groundwater comes in around 50°F in winter, and you need a 70–75°F temperature rise to hit 120°F at the tap. That knocks a "9.8 GPM" unit down to about 5–6 GPM in January — enough for two showers, or a shower plus a dishwasher, but not much more. We size units for winter conditions, not the sticker rating, and we've been called out to correct plenty of undersized installs where a homeowner was promised endless hot water and got lukewarm showers in December instead.
Maintenance Is Not Optional on Tankless
Portland-area water is soft compared to most of the country, but it still carries enough mineral content to scale a heat exchanger over time. Tankless units need descaling every 12–18 months, plus an inlet screen cleaning. Skip it and you'll get flow errors and a voided warranty.
Tanks need attention too — flushing sediment annually and checking the anode rod around year five will genuinely add years to the unit. Most homeowners never do either, which is exactly why the average tank dies at 11 instead of 15. Whichever direction you go, our team handles water heater installation, repair, and annual maintenance throughout Washington and Yamhill Counties.
How to Decide
Go tankless if you're staying 10+ years, your household regularly runs out of hot water, you want the floor space back in the garage, or your home is already plumbed for it. Stick with a tank if you're selling within five years, your gas service is undersized, or your budget is the deciding factor. Heat pump water heaters are a third option worth pricing out — Energy Trust of Oregon incentives can bring them close to standard tank pricing, though they need about 700 cubic feet of surrounding air space and they cool the room they're in.
Not sure which makes sense for your home? We'll look at your existing gas line, venting, and actual hot water demand before recommending anything. Call Hydro Plumbing at (971) 241-2628 for a straight answer and an upfront quote — licensed, insured, CCB #254405, serving Washington & Yamhill Counties including Tigard, Beaverton, Hillsboro, Lake Oswego, Tualatin, and Sherwood.