Water heater is 10 to 12 years old or older and showing rust-colored water
Water Heaters · Mercer Island, WA
Water Heater Installation in Mercer Island, WA
Most water heater installations in Mercer Island run $1,650–$4,800 installed, depending on tank size, fuel type, and venting needs. SPS Pro Services installs gas and electric units across the island, with most jobs scheduled within a few days and completed in a single visit.
Typical cost$1,650–$4,800
WarrantyWorkmanship warranty
AvailabilitySame-week visits
HoursMon–Fri 8am–6pm
Mercer Island's housing stock splits into two eras: mid-century ramblers and split-levels built in the 1950s and 60s near the town center and West Mercer, and larger custom rebuilds on teardown lots closer to the lake, many built in the last 15 years. Older homes often still have the original 40-gallon gas tank tucked in an undersized closet, which limits venting options, while newer builds have room for tankless systems or larger 50-75 gallon tanks feeding multiple bathrooms.
Local knowledge
What's different about water heater installation in Mercer Island
Mercer Island homes have their own quirks, and after years of visits here we know them well.
Many original Mercer Island homes from the 1950s-60s have narrow water heater closets sized for tanks that are no longer manufactured, so installs often require a low-boy tank or a code-compliant venting adjustment.
PSE supplies both gas and electric service on the island, and we size units to match whichever fuel line is already run to the home rather than proposing a costly fuel conversion.
Newer custom homes near the lake frequently run 3+ bathrooms off one unit, and we see a growing number of Mercer Island homeowners upgrading to tankless systems to keep up with soaking tubs and multi-head showers.
Symptoms we see daily
Signs you need water heater installation in Mercer Island
Tank is leaking or you notice pooling water at the base
Hot water runs out faster than it used to or takes longer to reheat between uses
Popping, rumbling, or knocking sounds coming from sediment buildup inside the tank
Pilot light won't stay lit, or an electric unit keeps tripping the breaker
No surprises
How a Mercer Island water heater installation visit works
1
Home assessment
We check your current tank's age, fuel type, and closet dimensions, plus your home's actual hot water demand based on bathroom count and fixtures.
2
Unit selection
We recommend tank size or tankless capacity based on whether your home is an original mid-century build or a larger newer construction, and confirm it fits existing venting and gas or electric lines.
3
Permit and code check
We pull the required King County permit and verify seismic strapping, expansion tank, and venting meet current code, which matters most in older homes with outdated setups.
4
Installation
Most swaps are done in 2-4 hours; tankless conversions or venting changes can take a half day. We haul away the old unit.
5
Final test and walkthrough
We test water temperature, check for leaks, and walk you through the shutoff valve and any warranty paperwork before we leave.
Flat-rate pricing
Water Heater Installation in Mercer Island — what it costs
Conservative ranges for the Seattle metro. Your written quote is exact before work begins.
| Job | Typical price |
|---|---|
| In-home estimateExact flat quote for your home | Free |
| Standard water heater installationTypical single-system job | $1,650–$2,700 |
| Mid-range water heater installationHigher-capacity or multi-zone equipment | $2,700–$3,750 |
| Complex water heater installationPremium equipment or difficult access | $3,750–$4,800 |
Prices reviewed by Sergei Petrov · July 2026. Parts availability can shift ranges — the quote you sign is final.
24/7 Emergency Line
Emergency dispatchNo hot water at 11pm? We pick up.
Office hours are Mon–Fri, but the emergency line never closes. Call any hour and we dispatch a licensed tech across Greater Seattle.
Straight answers
Water Heater Installation in Mercer Island — FAQ
How much does water heater installation cost in Mercer Island?
Most jobs land between $1,650 and $4,800 installed, depending on whether it's a standard tank swap or a tankless upgrade. Older homes with narrow closets or outdated venting sometimes need extra work, which we quote upfront before starting.
Can I install a tankless water heater in an older Mercer Island rambler?
Often yes, but the original 1950s-60s closets weren't built for tankless venting, so we typically need to run new venting through an exterior wall or the roof. We check this during the home assessment before quoting the job.
Do you handle both gas and electric water heaters on the island?
Yes. Mercer Island homes are served by PSE for both gas and electric, and we install units matched to whatever fuel line already runs to your home rather than pushing a conversion you don't need.
How fast can you install a new water heater in Mercer Island?
Most standard tank replacements are scheduled within a few days and completed same-day. Tankless installs or jobs requiring venting changes in older homes may need a follow-up visit for permit inspection.
Founder & Lead HVAC Technician, SPS Pro Services
EPA Section 608 UniversalNATE Core Certified14+ years in the trade
Reviews the pricing and service guidance on this page against SPS Pro Services's actual job records in Mercer Island and across the Seattle metro.
Prices reviewed July 2026
Also in Mercer Island
Other services our crew handles on the same routes.
Need water heater installation in Mercer Island?
Call (206) 427-8907 to get a straight quote on water heater installation for your Mercer Island home, weekdays 8am-6pm.