Water Heater Repair
& Installation
on O'ahu
No hot water? Alpha Omega Plumbing repairs, replaces, and installs all water heater types — including solar systems — across all of O'ahu. Fast response, upfront pricing.
Request Water Heater Service
Same-day appointments often available
What We Do
Complete Water Heater Services on O'ahu
Water Heater Repair
No hot water? Strange noises, leaks, or inconsistent temperature? We diagnose and repair all brands and models, often same-day.
Water Heater Replacement
When repair isn't cost-effective, we'll recommend the best replacement option and install it with minimal disruption to your day.
New Installation
Upgrading, remodeling, or adding a second unit? We size, supply, and install the right system for your home or business.
Solar Water Heater Repair
Hawaii's #1 water heater type — and our specialty. We service all solar water heating systems, from collectors to backup elements.
Tankless Water Heaters
Endless hot water, lower energy bills. We install and service on-demand tankless systems throughout O'ahu.
Flush & Maintenance
Annual flushing extends your water heater's life by years. We remove sediment buildup that hurts efficiency and causes early failure.
O'ahu's Solar Water Heater Specialists
Hawaii law requires solar water heaters on new residential construction — and for good reason. They cut water heating costs by up to 80%. But when they fail, most plumbers don't know how to fix them.
Alpha Omega has deep experience with all solar water heating systems on O'ahu. From failed backup elements to collector pump issues, we diagnose and repair them right.
Call for Solar Water Heater ServiceKnow Your Options
Water Heater Types We Service
Tank Water Heaters
The most common type on O'ahu. Storage tanks hold 30–80 gallons of preheated water. We repair and replace all major brands including Rheem, Bradford White, and A.O. Smith.
- ✓Lower upfront cost
- ✓Simpler installation
- ✓Works with solar backup
Tankless Water Heaters
Heat water on demand — no tank, no standby heat loss. Great for homes with high hot water demand or limited space. We install Navien, Rinnai, and Noritz units.
- ✓Endless hot water
- ✓Lower monthly energy cost
- ✓Longer lifespan (20+ years)
Solar Water Heaters
Required by Hawaii state law on new residential construction — and for good reason. Solar systems cut water heating costs by up to 80%. We service all solar systems including Rheem SolPak, Alternate Energy Technologies, and more.
- ✓Up to 80% energy savings
- ✓State-mandated on new builds
- ✓Qualifies for federal tax credits
Don't Ignore These
Signs You Need Water Heater Service
No hot water or not enough hot water
Water takes too long to heat up
Rusty or discolored water
Rotten egg smell from hot water
Popping, banging, or rumbling noises
Water pooling around the base of the unit
Your unit is 10+ years old
Skyrocketing electricity or gas bills
“Our solar water heater stopped working and two other plumbers said they couldn't figure it out. Alpha Omega diagnosed it in 20 minutes — a failed backup element — and had it fixed same day. Great experience.”
Patricia M.
Mililani, O'ahu
Common Questions
Water Heater FAQs
How long does a water heater last in Hawaii?
Standard tank water heaters last 8–12 years in Hawaii. The hard water and high mineral content on O'ahu can shorten lifespan, which is why annual flushing matters. Tankless units typically last 15–20 years. Solar systems with proper maintenance can last 20+ years.
My solar water heater isn't working — what should I do?
Check that the backup electric or gas element is functioning (most solar systems have one). If you have no hot water at all, call us — it could be a failed backup element, a broken collector, a pump issue, or a control failure. Solar system repair is one of our specialties on O'ahu.
How much does water heater replacement cost in Hawaii?
Replacement costs vary based on unit type and installation complexity. Tank water heaters typically run $1,200–$2,500 installed. Tankless units run $2,000–$4,500 installed. Solar systems vary widely. We provide a written, upfront estimate before any work begins.
Can you install a water heater the same day?
In many cases, yes. We stock common tank sizes on our service vehicles and can replace a standard unit same-day. For tankless or solar installations, we'll schedule at the earliest available time.
Do you offer a warranty on water heater installation?
Yes. We back our installation labor and all parts we supply. Manufacturer warranties on the units themselves typically range from 6–12 years depending on the brand.
Need Water Heater Service on O'ahu?
Same-day service often available. Upfront pricing. All types serviced — tank, tankless, and solar.