An instant water heater, also called an on-demand or tankless heater, usually costs more to install than a tank. Angi lists national tankless replacement at about $1,200 to $3,500, and HomeAdvisor shows about $1,400 to $3,900 installed. The unit is rarely the biggest swing. The gas pipe, vent, wiring and permit around it decide where you land in that range.
The term covers two different jobs. A whole-house unit replaces your tank and feeds every fixture. A point-of-use unit is a small heater at one sink or shower. This page covers what each costs to put in and why, so you can read a bid with confidence. If you are still deciding whether your house can take a tankless unit at all, the tankless water heater service page covers feasibility.
Published cost ranges at a glance
These are national figures from two large cost guides. They are not Woodburn quotes and not our prices.
| Job | Published range | Source |
|---|---|---|
| Tank water heater replacement | $600 to $2,500 | Angi, HomeAdvisor |
| Tankless water heater replacement | $1,200 to $3,500 | Angi |
| Tankless water heater installed | $1,400 to $3,900 | HomeAdvisor |
| Point-of-use (single fixture) unit | No verified range found | Get a line-item bid |
A separate HomeAdvisor page averages about $2,630 for tankless. We found no verified published range for point-of-use units, so we do not give one.
Five things that move the price
Two houses can buy the same heater and get bids that differ by a thousand dollars or more. These five factors explain most of it.
Fuel and unit size
Gas units cost more to buy and vent. Electric units are simpler to place but need heavy wiring. Bigger flow ratings cost more.
Gas line and meter
A larger gas pipe from the meter adds labor and materials. Replacing a tank with a similar tank rarely needs this.
Venting and condensate
A new sealed vent through a wall or roof, plus a condensate drain, is often the single largest add-on.
Electrical work
Gas units need an outlet. Electric whole-house units can need new breakers or a panel upgrade done by an electrician.
Access, haul-away and permit
Tight closets, attics and crawl spaces slow the work. The old tank must be drained and removed, and the permit and inspection are part of the job.
Point-of-use heaters: a smaller job with a narrower purpose
A point-of-use heater sits close to one sink or shower and heats only what that fixture draws. It makes sense at a far kitchen sink, a guest bath or a workshop, where you wait a long time for hot water to arrive from a distant tank.
The install is simpler than a whole-house swap. The plumber ties into the cold line, adds a shutoff and, for electric models, supplies a circuit sized to the unit. Smaller models run on a standard outlet, while larger ones need a dedicated 240 volt circuit. The wiring is often the main variable, so a quote should say which kind you are getting.
A point-of-use unit does not replace your main heater. It only makes sense when it solves one specific delay.
How to get a bid you can actually compare
Three vague bids teach you little. Three line-item bids teach you a lot.
- 1Ask for the scope in writingThe bid should name the exact model, whether it is gas or electric, and whether it is whole-house or point-of-use.
- 2Separate the unit from the extrasLook for separate lines for gas piping, venting, condensate drain, electrical, permit and old tank removal.
- 3Check the licensePlumbing work needs a CCB license and a plumbing contractor license from Oregon's Building Codes Division. Both can be looked up online by anyone.
- 4Confirm who pulls the permitThe plumber should say who applies for the permit and when the inspection happens.
- 5Get the price before workInsist on a clear price before the first tool comes out, not a number that shifts once the wall is open.
Install cost is only half the picture
Tankless units heat on demand, so they skip the standby loss of keeping a tank hot. Whether that saves enough to pay back a higher install price depends on your utility rates and how much hot water you use.
We have no verified Woodburn utility rate figures, so we will not guess at a payback period. Your gas or electric utility can give you current rates. Many tankless makers also call for a yearly flush, so budget a little for that maintenance.
Woodburn local note: licenses, permits and who inspects
Inside Woodburn, plumbing permits and inspections come from Marion County. Oregon's Building Codes Division says a water heater replacement needs a permit, and a contractor can use a minor label for that type of job. Ask your plumber to say in the bid who handles it.
To verify a plumber, Oregon directs you to two lookups, one for the CCB contractor license and one for the plumbing contractor license through the Building Codes Division. About 36 percent of Woodburn households rent, according to Census survey data, so renters should get a landlord's written approval before any water heater work.
- Source: City of Woodburn: Building
- Source: Oregon BCD: Residential permits
- Source: Oregon BCD: Licensed work
- Source: Oregon BCD: License search
- Source: U.S. Census Bureau: QuickFacts Woodburn city
Questions to ask before you accept any bid
- Is the price for a whole-house or a point-of-use unit?
- Does the quote include gas piping, venting, electrical and drain work, or are those extras?
- Is the permit and inspection included in the price?
- Who removes and disposes of the old tank?
- What does the yearly flush involve, and are isolation valves included?
- Does the plumber hold both the CCB and plumbing contractor licenses?
When replacing a tank costs less than going instant
If your current tank is failing and the gas pipe, vent and panel would all need work to go tankless, a like-for-like tank swap can cost far less. The water heater replacement service covers that path, and we can price both so you see the gap.
We also drive to Hubbard, about 4 miles from our Woodburn office, and Mount Angel, about 7 miles away, for water heater quotes and installs. Call (503) 974-3329 and we will tell you what we need to see before pricing.
Questions about this topic
Usually not. National guides put tankless installs at about $1,200 to $3,900 compared with roughly $600 to $2,500 for a tank. Houses that already have the right gas pipe and an outside wall behind the heater see the smallest difference.
We found no verified published range, so we will not quote one. The price depends on the unit, whether it needs a new circuit, and how far the plumber must run pipe. Call for a clear price before work starts.
Oregon requires a permit for water heater replacement, and Marion County issues plumbing permits in Woodburn. Ask whether the permit and inspection are in the bid or listed as an extra.
Gas models do not, beyond an outlet. Whole-house electric models often draw a lot of power, so an electrician or plumber must check your panel's spare capacity before you commit.
That is a lease and landlord question, not a plumbing one. Get approval and the scope in writing from the landlord before any work, since about 36 percent of Woodburn households rent.
Dealing with this at home right now? Call any hour and a person picks up.
Call (503) 974-3329Guidelines here are general. The Oregon Plumbing Specialty Code, based on the UPC, and the manufacturer's instructions decide what is allowed on your job.