A water heater rarely fails at a convenient moment, and in an older Seattle house the replacement is rarely a simple swap. The old unit may vent into a brick chimney, sit on a gas line sized for something smaller, or share a panel with no room for a heat pump model. Nic’s Plumbing installs tank, tankless and heat pump water heaters in Seattle’s historic homes, with three priced options you approve before we start, the King County code items done properly, and photos of the finished work.
- Your optionsStandard tank, tankless (on-demand), or heat pump (hybrid) water heater
- King County codeTwo seismic straps, an expansion tank on closed systems, TPR discharge to an approved termination
- Seattle City Light$750 rebate on qualifying ENERGY STAR heat pump water heaters (confirm the current amount with City Light)
- How we quoteGood / Better / Best digital pricing, approved before any work
Why is it so hard to get a ballpark quote on a water heater?
Homeowners ask this constantly, usually as “I just want a minimum and a maximum before I waste everyone’s time.” Fair question. In a newer house the swap is predictable. In a 1915 Queen Anne foursquare or a 1928 Ballard bungalow, the price is decided by everything around the heater: where the old flue goes, whether the gas line can feed a bigger burner, whether the panel has a free 240-volt circuit, and whether the last install ever had straps or an expansion tank at all.
That is why a “starting at” number over the phone so often grows on the day, and why a quote built on an iPad in your basement can feel like a sales pitch instead of a diagnosis. We do it the other way around: look at the heater, the venting, the gas and electrical and the space it lives in, then send three written prices that do not move. Read them at the kitchen table and approve one when you are ready. No instant discount, no today-only price.
And if you called about a dripping fitting or a pilot that keeps going out, we will tell you whether the tank actually needs replacing. Plenty of heaters get condemned for a failed thermostat, a bad element or a spent anode rod. Our answer page on whether you really need a new water heater covers the signs that matter.
Tank, tankless or heat pump: which fits an old Seattle house?
These are three different answers more than three rungs on one ladder, so we lay them out as options and tell you plainly which we would choose for your house. Each arrives as its own written price in the digital quote.
Standard tank, installed right
A like-for-like gas or electric tank in the same spot, brought up to current code. The sensible choice when the old one served the house well and budget is the priority.
- Correctly sized tank for your fixtures and household
- Two seismic straps, expansion tank, TPR discharge line
- New shutoff and flex connectors, old unit hauled away
- Permit and inspection handled
Tankless, where the house allows
Endless hot water from a wall-hung unit that frees up floor space. Worth it when the gas supply and venting can support it and you plan to stay a while.
- Gas line sized or upsized for the burner
- Sealed direct venting through an exterior wall, not the old chimney
- Condensate drain and isolation valves for easy flushing
- Honest note on how many fixtures it can run at once
Heat pump water heater
A hybrid tank that pulls heat from the surrounding air, uses far less electricity than a standard electric tank, and quietly dries out a damp Seattle basement while it runs.
- Dedicated 240-volt circuit checked or added
- Placement planned for air volume, sound and condensate drain
- Qualifying ENERGY STAR model so the City Light rebate applies
- Everything in Good, plus rebate paperwork help
We go deeper on the first two in tankless vs. tank for Seattle homes and on the third in heat pump water heaters in Seattle. For the quote itself, see how our free Good / Better / Best quote works.
Old-house note: venting, gas and electrical realities
Most pre-war Seattle homes vented the water heater into a masonry chimney alongside the furnace. Once the furnace is converted or moved, that chimney can be oversized for a lone water heater and draft poorly. A gas line run for a 40-gallon tank usually cannot feed a tankless burner without upsizing, and many old panels are full, which matters for a heat pump model. Homeowners are sometimes told a tankless install is “virtually impossible” in a basement closet. Usually it just needs the venting and gas work spelled out and priced, which is exactly what your quote does.
What King County code requires on a new water heater
A water heater replacement in Seattle is permitted and inspected through Public Health – Seattle & King County, and the inspector looks for a short list of items missing on a surprising number of older installs. Every tier includes them.
- Two seismic straps, upper third and lower third of the tank
- Expansion tank on closed systems (backflow preventer or pressure regulator present)
- TPR valve discharge piped to an approved termination
- Permit pulled and inspection scheduled by us
The straps are not a formality; a tank that tips in a quake can tear open its gas line. The expansion tank absorbs the pressure spike every heating cycle creates on a closed system, and the TPR discharge line keeps a safety-valve release from becoming a scalding surprise.
How a water heater install goes with Nic’s Plumbing
Look at the whole setup
Fuel, venting path, gas line size, panel capacity, shutoffs, drainage and the space around the heater, not just the model number on the label.
Three priced options
Tank, tankless and heat pump where each fits, written down with what is included. You approve one on your phone before anything starts.
Protect the house
Canvas runners from the door to the utility room, shoe covers, a covered work area, and a careful path out for the old tank.
Install, strap, test
New heater set and strapped, expansion tank and TPR line run, gas or electrical connections tested, hot water back the same day in nearly every case.
Prove it with photos
Before-and-after pairs of the install, the inspection record, rebate paperwork if it applies, and a utility room left cleaner than we found it.
When your technician is on the way you get a live tracking link, so you are not tied to the house for a four-hour window. Every job runs on the same standard; see the full Nic’s Plumbing process.
Comparing the three at a glance
| Consideration | Standard tank | Tankless | Heat pump |
|---|---|---|---|
| Hot water supply | Fixed by tank size; recovers over time | Continuous, limited by flow rate | Tank plus faster recovery in hybrid mode |
| Efficiency position | Baseline | Higher; no standby loss | Highest for electric; far less power than a standard electric tank |
| Old-house install needs | Existing vent, gas or electric | Upsized gas line, new sealed venting | 240-volt circuit, air volume, condensate drain |
| Typical service life | Often around 8 to 12 years | Often 15 to 20 years with annual flushing | Comparable to a tank; simple to maintain |
| Rebates | None we know of | None we can confirm | Seattle City Light $750 on qualifying models |
The Seattle City Light heat pump water heater rebate
Seattle City Light offers a $750 rebate to its residential customers on a heat pump water heater, provided the unit is an ENERGY STAR model on the qualified product list at the required efficiency tier. It can be taken as an instant discount through a participating contractor or by rebate form submitted within 93 days of purchase, one rebate per customer. Programs change, so confirm the current amount with City Light before you count on it; we flag it in your quote if your house qualifies.
Washington’s state Home Electrification and Appliance Rebates program also lists heat pump water heaters as an eligible measure for income-qualified households, but publishes no dollar figure, so we do not quote one; ask us and we will point you to where to check. Our guide to water heater lifespan and efficiency explains what the labels mean for your bill.
What the photo documentation shows on a water heater job
The old heater in place: corrosion at the fittings, the vent connection, the missing straps, the absent expansion tank, and the gas or electrical supply feeding it.
The new unit strapped at upper and lower thirds, the expansion tank on the cold side, the TPR line run to its termination, new valves, the vent or circuit work, and the inspection sign-off.
Out of hot water, or planning ahead? Let us look.
We will check the heater, the venting, gas and electrical, then send Good, Better and Best options in writing to approve before any work begins.
Go deeper on water heaters
Tankless vs. tank in Seattle homes
Where each one wins, and what tankless really needs in an old house.
Heat pump water heaters
How they behave in a cold Seattle basement, plus the rebate details.
Water heater lifespan and efficiency
How long each type lasts and what the efficiency ratings mean.
Do I really need a new water heater?
The signs that mean replace, and the ones that mean repair.
We install water heaters from Queen Anne and Magnolia to Ballard, Fremont, Wallingford, South Lake Union, Belltown and Downtown. See all service areas.
Questions homeowners ask about water heater installation
How long does it take to install a water heater?
A straightforward tank replacement in the same spot is usually done in a few hours, with hot water back the same day. Tankless conversions and heat pump installs often take a full day because of the venting, gas line or electrical work. Your written quote states the expected schedule for the tier you choose.
Do I need a permit to replace a water heater in Seattle?
Yes. Water heater replacements in Seattle are permitted and inspected through Public Health – Seattle & King County, and the inspection checks seismic strapping, the expansion tank and the TPR discharge. We pull the permit and schedule the inspection as part of every tier, and the record goes in your file next to the before-and-after photos.
Can a tankless water heater work in an old Seattle house?
Usually, yes, but it depends on the gas supply and where the unit can vent. Many older homes need the gas line upsized and a new sealed vent through an exterior wall rather than the old chimney. Those are real costs, which is why some companies wave the idea off. We spell out what your house needs and price it as one of your three options.
Will a heat pump water heater work in my cold, damp basement?
Seattle basements suit them well. The unit pulls heat and moisture from the air around it, so it dehumidifies the room as a side effect, and in hybrid mode it switches to electric elements if the space gets very cold. It needs open air around it, a condensate drain and a dedicated 240-volt circuit, all of which we check before quoting.
How much does water heater installation cost in Seattle?
There is no single honest number, because your house’s venting, gas line, electrical and heater location drive most of the difference between one install and the next. That is why we look first, then quote three tiers in writing, each with its own price, before you commit to anything. The approved number is the number on the invoice.