Water Heater Replacement in Bellevue, WA
Most people replace a water heater once or twice in their lives, usually under time pressure because the old one has just failed. That is a bad position from which to make a decision involving a unit you will live with for the next decade or more.
By Ramin Shahbaziasl, Owner, Eastside Repipe & Plumbing · Last updated September 17, 2025
This guide covers what replacement actually involves, how to choose the right unit, what separates a good installation from one that fails early, and what to ask before you hire anyone.
When Replacement Beats Repair
Not every problem means a new unit. These signs generally do:
Water pooling around the base. A leaking tank body cannot be repaired
Rusty or discolored hot water, which usually means the tank is corroding from inside
Rumbling or popping from heavy sediment that flushing no longer clears
The unit is 10 to 15 years old and needs repeated repairs
Hot water capacity has dropped noticeably despite maintenance
Visible corrosion on the tank or fittings
A single failed component on a five-year-old unit is usually worth repairing. Multiple issues on a twelve-year-old unit generally are not. Our guides on why a water heater stops working and when to replace a water heater cover the diagnosis in more depth.
Choosing the Right Unit
Tank or Tankless
A storage tank costs less up front, handles simultaneous demand better, and installs quickly. A tankless unit costs more to install, lasts roughly twice as long, and never runs out.
One local factor matters more than most comparisons mention: tankless output depends on temperature rise, and incoming groundwater here is cold. A unit rated at 5 gallons per minute in a warmer climate delivers meaningfully less in the Puget Sound region. Sizing off a spec sheet without accounting for that is the most common reason homeowners end up disappointed with a tankless install.
Our full tankless vs traditional comparison covers the tradeoffs in detail. If you have decided on tankless, we handle tankless installation across the Eastside.
Sizing
Undersizing means cold showers. Oversizing means paying to heat water you never use. The right size depends on household size, how many fixtures run at once, and your usage pattern rather than a rule of thumb based on bedrooms.
Efficiency
Higher efficiency units cost more and pay it back over time, so the calculation depends on how long you plan to stay. The Energy Star product finder lists certified models if you want to compare before you talk to anyone.
What the Replacement Process Involves
Assessment. We look at the existing unit, the pipe and venting configuration, gas or electrical capacity, and the space available. This is where hidden costs surface, so it happens before the quote rather than after
Selection. We recommend a unit sized for your household, and explain why. If a tank is the better value in your situation, we will say so
Written quote. Full cost including labor, materials, permits, disposal of the old unit, and any gas or electrical work required
Preparation. Water and power or gas shut off, old unit drained and removed
Installation. New unit set, plumbing and gas or electrical connections made, venting configured to code
Testing. Temperature, pressure, and relief valve checked, connections verified for leaks
Cleanup and walkthrough. Old unit hauled away, and we show you the shutoff, the thermostat, and what maintenance the new unit needs
A straightforward tank swap typically takes two to four hours. A tankless conversion takes longer, particularly if the gas line or venting needs work.
Why Installation Quality Decides the Outcome
Most premature water heater failures trace back to installation rather than the equipment. Common causes:
Undersizing, particularly on tankless conversions
Inadequate gas supply for the unit's BTU rating
Improper venting, which is both a performance and a safety issue
Poor connections that leak slowly for months before anyone notices
Skipped permits, which surface later during a home sale
Bad installation also voids most manufacturer warranties, so the unit that was cheaper to install becomes the one you replace first.
Gas work in particular is not a place to economize. Improperly vented gas appliances present carbon monoxide risk, and gas line work carries obvious hazards. Puget Sound Energy offers free safety checks on gas appliances if you ever want an independent look.
What to Ask Before You Hire
Are you licensed, bonded, and insured in Washington?
Does the quote include permits, disposal, and any gas or electrical upgrades?
What size are you recommending, and how did you arrive at it?
What warranty covers the unit, and what covers your workmanship?
Will you pull the permit, or is that on me?
How long will the job take, and will I be without hot water overnight?
You do not have to take anyone's word on the licensing question. Washington requires plumbing work to be performed by certified plumbers employed by a licensed contractor, and you can check any company's license, bond, and insurance status for free through the state Department of Labor and Industries.
Getting the Most From a New Unit
Set the thermostat to 120°F. The Consumer Product Safety Commission urges homeowners to use that setting to reduce or eliminate most tap water scald injuries. It also slows scale buildup and lowers your energy bill
Flush the tank annually to clear sediment, or descale a tankless unit on the same schedule
Check the anode rod every two to three years on a tank unit. It corrodes so the tank does not, and replacing it is far cheaper than replacing the heater
Test the temperature and pressure relief valve yearly
Keep the area around the unit clear, particularly the venting on gas models
Look at the base occasionally for early moisture
Most of this is covered in a whole home plumbing inspection if you would rather have it handled.
Cost and Value
Replacement cost depends on the unit type, whether the installation is like-for-like, and whether gas or electrical work is needed. Our water heater repair cost guide covers typical local pricing, and we quote the full job in writing before starting.
The larger cost is usually not the unit. It is what happens when a poorly installed one fails early, or when an undersized one has to be replaced again in three years.
Frequently Asked Questions
How long does water heater replacement take?
Two to four hours for a straightforward tank swap. Longer for tankless conversions, especially where gas line or venting work is needed.
Do I need a permit to replace a water heater?
In most jurisdictions here, yes. We pull and manage the permit as part of the job. Unpermitted work tends to surface during a home sale, which is an expensive time to discover it.
Can I replace a water heater myself?
Gas units involve gas connections and venting, and electric units involve dedicated circuits. Both are permitted work in most cases, and both carry real safety risk. This is not a DIY project we would recommend.
Will a new water heater lower my energy bill?
Usually, yes, particularly replacing a unit over ten years old. How much depends on the efficiency of the new unit and your usage. Correct sizing matters as much as the efficiency rating.
What temperature should I set my new water heater to?
120°F. Hot enough for showers, laundry, and dishwashing, and substantially safer than higher settings.
Do you handle both tank and tankless installations?
Yes, gas and electric, tank and tankless. We size the unit for your household rather than defaulting to whatever is easiest to install.
Book a Water Heater Replacement
If your unit is showing the signs above, replacing it on your schedule is considerably cheaper and less disruptive than replacing it after it fails.
Request a quote or call 425-331-2011. We will assess the existing setup, recommend the right unit and size, and give you the full cost in writing before any work begins. We serve Bellevue, Kirkland, Redmond, Bothell, Seattle, and the wider Eastside service area.
