Really Cool Hot Water
Hybrid PV Solar Hot Water
Solar water heating systems have been around for decades, but this system is better. Our hybrid solar water heating system uses advanced PV micro-grid technology with conventional tank-style storage to reduce energy costs and save the average family hundreds of dollars a year.
The cost of KumuKit hybrid solar water heating systems is comparable to traditional solar water heating systems, but are cleaner, more reliable, and virtually worry-free. No pumps required!
Energy Hog
Show Me the Energy Hog
There’s an energy hog in your home. The average Hawaii family uses a huge amount of their electrical energy just to heat water. Here’s the breakdown of energy usage:
  • Refrigerator, 15%
  • Air Conditioning, 12%
  • Lights, 8%
  • Cooking, 8%
  • Everything Else, 12%
But, there’s one source that devours more energy than any other source—your water heater, at about 40%!
† Source: Hawai‘i Energy
KumuKit, KumuKit, gotta get a KumuKit ... solar water heater and backup battery and appurtenances installed yesterday. Today installation of photovoltaic batteries and completion of wiring within Controllers then HECO and City Inspection ... every one of workers knows what to do so going well ... appreciate your handling all aspects related to planning and installation. Kudos to Sheldon and Lisa for their service and your men here installing the system ...”
— Andrew K, Pearl City

PV Solar Hot Water vs Thermal Hot Water

Modern, Hybrid PV Solar Hot Water Traditional, Thermal Solar Hot Water
Contemporary, lightweight panels; 2-3 times less weight on your roof Heavy, oversized, water-filled panels
No plumbing on your roof and no leaks! High-maintenance, leak-prone
Produces hot water even on cloudy days; PV panels only need sunlight to make electricity Traditional solar water panels must get hot to produce electricity
Produces hot water during power outages Requires pumps and motors that need electricity to get water pumped up to your roof
Heats water longer during the day from sunrise to sunset (typically 7am to 5pm) Typically runs from 10am to 3pm when and if your roof and panels get hot enough
Tanks are glass ceramic lined, not metal, to prevent corrosion from the inside out of the tank. They are very well insulated and if not used over night, typically drop just 1° in water temperature. Not
Far less maintenance; PV panels have no moving parts Uses clogs, motors and pumps that will eventually need to be replaced
I would like to say that everyone that worked on installing our system was very respectful, friendly and professional. Jason Lamb was the plumber on the job and he explained to both my husband and I how everything works. There was also an electrician by the name of Troy (I believe that was his name) was the first one on the job and he explained to me how he was going to run all the electrical. I’d like to say THANK YOU to everyone from Tanys to Lisa and all of the guys on the job for helping me to make this happen. I’ll definitely refer you guys if anyone asks. Mahalo a nui loa.”
— Maurine O, Kapolei