Tankless installation: endless hot water, less space.
A tankless unit heats on demand, so you don’t run out and you reclaim the space a tank takes up. We size and install it right.
Endless hot water
How tankless works, and when it fits.
A tankless water heater heats water as it flows through the unit instead of keeping a tank hot around the clock. That means you don’t run out partway through a shower, and you’re not paying to keep forty or fifty gallons hot while you’re at work. It also takes up far less space, which matters in a tight Oahu condo or a small utility closet.
Tankless isn’t automatically right for every home, and we’ll say so. A household running several hot-water fixtures at once needs a properly sized unit or it won’t keep up, and the gas line and venting sometimes need work to support it. We look at your actual usage and setup before recommending anything, so you’re not disappointed by an undersized unit.
When tankless is the right fit, we size it correctly, handle the gas line and venting properly, install to code, and dial it in before we leave. The payoff is real: endless hot water, a smaller footprint, and a unit that often outlasts a traditional tank.
What’s included
What tankless installation covers.
- Right-sizing. We size the unit to your home’s real hot-water demand so it keeps up.
- Gas and venting. Gas line and venting handled properly and inspected where required.
- Code-compliant install. Connections done to code and the unit dialed in before we leave.
- Conversion from tank. We walk you through switching from a traditional tank, including any line changes.
- Space reclaimed. A wall-mounted unit frees up the closet or corner a tank occupies.
- Maintenance setup. We set you up with a descaling plan to keep it running in hard water.
When to call us
Tankless might be right if:
- You run out of hot water with a tank
- You want to reclaim the space a tank takes up
- Your current heater is due for replacement anyway
- You want a unit that typically lasts longer
- You’re remodeling and rethinking the utility space
- You’re tired of paying to keep a tank hot all day
If any of these sound like you, it’s worth a conversation. We’ll look at your setup and give you a straight answer on whether tankless makes sense.
The way we work
We’ll tell you if tankless isn’t worth it.
Tankless is great for the right home and a poor fit for the wrong one. We look at your real usage and tell you the truth, not just sell the pricier unit.
Start my fix“John always takes care of us. We always appreciate the prompt service, and all their plumbers are highly skilled.”
Oahu specifics
Tankless and tight island spaces.
Space is at a premium in a lot of Oahu homes and condos, and a wall-mounted tankless unit frees up the closet or corner a tank would occupy. For homeowners reworking a utility area or a small home, that alone is often reason enough to consider the switch, on top of never running out of hot water.
Hard water is the one thing to plan for. Mineral content scales up the inside of a tankless unit over time, so periodic descaling keeps it running well, our tankless water heater repair service handles that, and we build it into your maintenance plan. Pair tankless with a whole-home filtration system and you reduce the scaling even further.
Related work: Tankless Water Heater Repair · Water Heater Installation · Gas Line Installation. 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 tankless 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 tankless 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 tankless 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
Will tankless give me endless hot water?
It heats on demand, so you won’t run out the way you do with a tank. The key is sizing, a unit matched to your home keeps up even with multiple fixtures running. We size it right.
Can I switch from a tank to tankless?
Usually yes. Sometimes the gas line or venting needs adjusting to support the unit. We look at your setup and tell you exactly what the conversion involves before you commit.
Does tankless save money?
It can, you’re not paying to keep a tank hot around the clock, and tankless units often last longer. The upfront cost is higher, so we’ll talk through the math for your home.
Do tankless units need maintenance?
Yes, periodic descaling, especially with hard water, keeps it running well. We set up a schedule and can handle it.
How long does installation take?
It varies with whether the gas and venting need work. We’ll give you a clear timeframe after looking at your setup.
Are you licensed for gas work?
Yes, Hawaii plumbing contractor license #37423. Gas line and venting work is done to code.
Get on the schedule
Tell us about your tankless 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.