It usually starts with a puddle. You go down to the garage and there’s water spreading out from under the tank, or there’s no hot water at all on a cold morning.
If your home is one of the many Kent houses built in the 1990s or early 2000s, there’s a good chance it’s still on its original water heater, or the first replacement. Now you’re calling around and the quotes don’t match.
Here’s what should be in a proper replacement, so you can tell which quote is actually complete.
What a Code-Compliant Water Heater Swap in Kent Includes
A water heater looks simple. Tank in, tank out. But Washington follows the Uniform Plumbing Code, and there’s a list of things a replacement has to include. These aren’t upsells. They’re the rules.
The Permit, and Why Skipping It Costs You Later
Under the plumbing code Washington uses, installing or replacing a water heater requires a permit, even when it’s the same size in the same spot. Kent is no exception.
Some installers skip the permit to save time and quote lower. The problem shows up later. When you sell your house, an inspector may flag unpermitted work. If the heater ever leaks or causes damage, your insurer may ask whether it was installed to code. A permit and inspection are cheap protection compared to either of those conversations.
There’s a practical upside too. The inspector is a second set of eyes on work you can’t easily judge yourself. If a strap is in the wrong spot or a vent connection isn’t right, it gets caught and fixed before it becomes your problem. We schedule the inspection as part of the job, so you don’t have to chase it down yourself or take a day off waiting around.
Seismic Strapping Done Right
We live in earthquake country, so water heaters have to be strapped to resist moving in a quake. The code calls for straps in two places: one in the upper third of the tank and one in the lower third, with the lower strap at least four inches above the controls. The straps get anchored into the wall framing.
Here’s a detail that matters. Perforated plumber’s tape, the thin metal strip with holes in it, is not an acceptable strap. If you see that on your current tank, it was never right.
Expansion Tank, Relief Valve and Drain Pan
When water heats up, it expands. In most homes, that extra pressure has nowhere to go, so the code requires an expansion tank on closed plumbing systems. It’s that small tank you’ll often see mounted on the cold water line above the heater. Without it, the pressure stresses your pipes, fixtures and the heater itself.
Every heater also needs a working temperature and pressure relief valve with a discharge line routed safely. And depending on where the heater sits, a drain pan underneath to catch leaks. If your heater lives in a garage, there are rules about protecting it from vehicle impact too.
Signs Your Current Tank Was Never Up to Code
It’s worth taking a look at your existing heater before anyone quotes the new one. A few things tell you the last install cut corners.
Perforated plumber’s tape wrapped around the tank instead of real seismic straps. No expansion tank anywhere near the cold water line. A relief valve with no discharge pipe, or one that ends a few inches off the floor in the middle of the garage. A gas line connected straight to the heater with no sediment trap. Rust streaks or soot marks around the top where the vent connects.
None of these mean you’re in danger today. But they tell you two things. The replacement will need more work than a simple swap, and you should expect a proper quote to include fixes for each of them. If a bidder looks at that setup and quotes “same as before,” they’re planning to repeat the same mistakes.
Why Two Quotes for the “Same” Water Heater Can Look So Different
You call three companies and get three very different numbers for what sounds like the same job. Usually the difference isn’t the tank. It’s what’s included around it.
The Line Items Cheaper Quotes Tend to Leave Out
Look for these on any quote:
The permit and inspection. Proper seismic straps, not plumber’s tape. An expansion tank, or confirmation that your existing one is still good. A new relief valve and discharge line. A cold water shutoff valve. Haul-away and disposal of the old heater.
If one quote lists all of those and another lists “water heater, installed,” you’re not comparing the same job. Ask the lower bidder to put each item in writing. You’ll learn a lot from the answer.
Gas Connections and Venting
For gas water heaters, a few more details matter. The gas line needs a sediment trap, a short drop that catches debris before it reaches the burner. Gas and water piping need proper bonding. And the venting has to be correct for the new unit, with proper clearances and slope, because a bad vent can push exhaust back into your home.
These are the parts you don’t see once the job is done, and they’re the ones that matter most for safety.
Questions to Ask Every Bidder
Keep it simple. Ask each company:
- Is the permit included, and will you schedule the inspection?
- What kind of seismic straps do you use?
- Is an expansion tank included, and if not, why not?
- Are you replacing the relief valve and discharge line?
- Is haul-away included?
- And how long is the labor warranty on the installation itself?
The answers will tell you more than the price will. A company that answers all six in writing is giving you a real quote.
Replace With Another Tank or Switch to Tankless?
This is a fair moment to ask the question, because you’re paying for labor either way.
Same Size or Bigger?
Before deciding on the type, think about the size. A lot of Kent homes from the 1990s came with a 40 or 50 gallon tank chosen for the family living there at the time. If you’ve added people, a soaking tub or a bigger washer since then, the old size might be part of why you keep running out.
Going up a size is sometimes easy and sometimes not. A bigger tank is taller or wider, so it has to fit the space, the stand and the clearances. A larger gas unit may also need a different vent size. We look at your actual usage first. A lot of the time the honest answer is “same size is fine”, and that keeps the swap simple.
When Another Tank Still Makes Sense
If your family is happy with how much hot water you get, your budget is tight right now, or you need hot water back today, a properly installed tank is a solid choice. Nothing wrong with it.
When Tankless Earns Its Place
If you keep running out of hot water, want to free up floor space in the garage, or plan to stay in the home for a long time, tankless deserves a look. Keep in mind that converting from a tank to a tankless gas unit usually involves both plumbing and gas permits, and sometimes a larger gas line or new venting. So it’s a bigger project than a straight swap.
We wrote a full breakdown of whether tankless water heaters are worth it for Seattle-area homes. If you’re leaning that way, our tankless water heater installation page covers what the switch involves, and our tankless water heater replacement page explains how we handle swapping out an existing unit. If the timing is rough, financing options can help spread the cost.
In Kent, the Right Water Heater Replacement Is the One With Every Line Item Spelled Out
A water heater replacement should be a boring job. Permit pulled, straps anchored into framing, expansion tank in place, relief valve piped correctly, gas trap and venting done right, old tank hauled away. When any of that is missing, the cheaper quote stops being cheaper. It just moves the cost to your home inspection, your insurance claim or your next repair. So when you compare quotes for your Kent home, compare the line items, not just the totals. The one that spells everything out is usually the one you can trust.
Water heater leaking or out of hot water? Request a free quote or call 206-750-5042. We’ll give you a written, itemized price that includes everything code requires, so there are no surprises.
