Water heater installation, sized and done right.
When it’s time for a new water heater, the install matters as much as the unit. We size it right, install it to code, and test it before we leave.
A new unit, done right
The right unit, installed correctly.
When a water heater reaches the end of its life, a leaking tank, deep corrosion, or an age where repairs stop making sense, replacement is the smart move. The unit you choose matters, but so does the installation. A heater that’s the wrong size, or connected poorly, won’t give you the hot water or the lifespan you paid for.
We start by sizing the replacement to your home’s actual hot-water needs, so you’re not stuck with a unit that runs out or one that’s bigger than you need. Then we install it to code, with proper connections and venting, and we test it before we leave to confirm it’s heating the way it should.
If you’re weighing whether to go with a traditional tank or switch to tankless, we’ll walk you through it honestly based on your home and your usage. Either way, you get a clean install and a unit that works the day we leave and keeps working.
What’s included
What water heater installation covers.
- Right-sizing. We size the new unit to your home’s real hot-water demand.
- Tank installation to code. Proper connections, venting, and code-compliant setup.
- Old unit removal. We haul away the old heater and leave the space clean.
- Tested before we leave. We confirm the unit heats properly before calling it done.
- Tank or tankless guidance. Honest advice on whether a traditional tank or tankless fits your home.
- Clean install. The work area left tidy and the unit ready to use.
When to call us
Time for a new water heater if:
- The tank is leaking from the body
- The unit is more than ten to fifteen years old
- Repairs are adding up on an aging unit
- Rust and corrosion are advanced
- You’ve outgrown your current unit’s capacity
- You want to upgrade to a more efficient model
A tank leaking from its body can’t be repaired, and it can fail suddenly. If yours is leaking, don’t wait on the replacement.
The way we work
Sized right, installed right, tested.
A water heater is only as good as its install. We size it to your home, install it to code, test it, and hold the price we quote. No surprises.
Start my fix“Kelvin and JB did an excellent job for us. They came on time and we did not encounter any problem after installation.”
Oahu specifics
Installs in tight Oahu spaces.
Space is at a premium in a lot of Oahu homes and condos, and water heaters often live in tight closets or corners. We handle these installs carefully, making sure the connections, venting, and clearances are right even when the space is snug. A clean, correct install in a tight spot is exactly the kind of work we do regularly here.
We’ll also help you decide on the right unit. If your usage and home suit it, a tankless unit frees up the closet a tank occupies, our tankless water heater installation service covers that. If a traditional tank is the better fit, we size it correctly so you get the hot water you need without paying to keep an oversized tank hot.
Related work: Water Heater Repair · Tankless Water Heater Installation · Repiping. Not sure which one you need? Tell us what’s happening and we’ll point you the right way, or call (808) 445-3585. You can also see recent jobs.
What working with us looks like
Straightforward, start to finish.
The first thing we do on any water heater installation job is figure out what’s actually going on. We look at the real problem instead of guessing, and we explain what we find in plain language, no jargon, no scare tactics. You’ll know what’s wrong and what your options are before anything else happens.
Then you get a clear price. The number we quote is the number you pay, which is the whole reason John started Shoreline back in 2019 after watching another company do it the wrong way. A licensed plumber does the work, keeps you posted along the way, and cleans up the area before leaving. We finish by checking that everything runs the way it should.
None of that changes with the size of the job. A small water heater installation call and a big one get the same honest diagnosis, the same clear price, and the same crew that takes pride in the work and leaves your place clean. We would rather do it right and earn the next call than rush it and lose your trust, because the reviews our customers leave are the only advertising we really count on.
That approach is why so many of our customers call us back and ask for our crew by name. If you’ve got a water heater installation question or you’re ready to get on the schedule, reach out through our contact page or call (808) 445-3585. We answer, and we’ll give you a straight answer.
Why Oahu homeowners choose us
Honest, local, and licensed.
- The quote is the price. We hold the number we give you, with no surprise add-ons partway through.
- Licensed and accountable. Hawaii license #37423. If it’s not right, we make it right.
- A local Oahu crew. We know island homes, older condos, and the plumbing quirks that come with both.
- We show up when we say. On-time arrivals and clear communication so you’re not stuck waiting all day.
- Rated 4.9 across 377+ jobs. Real reviews from real Honolulu homeowners, on Google, Yelp, and Angi.
It’s a simple promise: tell you the truth, charge what we said, and do the work right the first time. That’s the standard John set when he founded Shoreline, and it’s the standard every plumber on the crew works to on every job, big or small, residential or commercial. More about how we work, or see recent jobs across Oahu.
Questions, answered straight
Frequently asked questions
How do I choose the right size?
We size the unit to your home’s real hot-water demand, the number of people and fixtures, so it keeps up without being oversized. That’s part of the install, you don’t have to figure it out yourself.
Do you remove the old water heater?
Yes, we haul away the old unit and leave the space clean as part of the installation.
Tank or tankless?
It depends on your home and usage. Tankless frees up space and gives endless hot water but costs more upfront. We’ll give you the honest comparison for your situation.
How long does an installation take?
A straightforward tank replacement is usually done in a few hours. We’ll give you a clear timeframe when we look at your setup.
Will you test it before leaving?
Always. We confirm the unit is heating properly and the connections are sound before we call the job done.
Are you licensed?
Yes, Hawaii plumbing contractor license #37423. Installations are done to code and tested.
Get on the schedule
Tell us about your water heater installation
Send the details and we’ll reach out to set up a visit. Or call John’s crew now at (808) 445-3585, we answer.