#1 Home Improvement Retailer

Internet #203715807


Heat Recovery Water Heater System - Zero Energy

  • Compatible with major brands of HVAC and water heater systems
  • Designed to create hot water when the AC is in use
  • Produces hot water with heat pump systems in the warm season
  • See More Details

Product Overview

ZeroEnergy is a unique, innovative heat recovery system that provides free hot water while your air conditioner (AC) system is running. It connects to both your outdoor AC unit and your water heater, helping them both work more efficiently. Because water heating can be as much as 30% of your total energy bill, the higher your current water heating bill, the quicker ZeroEnergy will pay for itself. ZeroEnergy works so well that in the warmer months when your AC is running constantly, the hot water portion of your energy bill can be reduced to zero. Please see the attached product and installation videos for more details. Installation is available through The Home Depot certified installer network, so please call 813-978-3733 to speak with an Olive Tree Energy technician for product and installation questions.
  • Creates free hot water during AC use which reduces your overall energy costs
  • Also produces hot water during heating season with heat pump systems
  • Reduces your carbon footprint and helps protect the environment
  • Has no pumps or moving parts to fail so requires no electrical power input
  • Requires zero maintenance and includes a 10 year warranty
  • Installs on all major brands of HVAC and water heater systems
  • Covered under the Magnuson-Moss warranty act, so won’t void any warranties
  • Less expensive and outperforms all other systems like tank-less, solar or heat pump water heaters
  • Works with HVAC package units ranging from 1.5 to 6 tons (larger systems available upon request)
  • Depending upon AC size, produces between 8 and 20 gal. of 50 degree rise hot water per hour of AC system run time
  • Manufactured in America by Olive Tree Energy and brought to you by Gone Green Earth--two companies specializing in money saving energy efficiency solutions
  • ZeroEnergy installation kit with the necessary components for connection to all major HVAC and water heater brands is available separately
  • Requires installation by a certified HVAC and plumbing technician

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Finish Family
Aluminum, copper and zinc
Product Type
Heat Recovery Systems
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty
10 years

Questions & Answers


Can these be used in a system with a recirculating pump?

Asked by Tim March 3, 2021

Will it circulate properly if the PT is on the side of the water heater instead of the top?

Asked by Chris May 20, 2020

Hi Chris. Thanks for your inquiry. Your water heater tank with the T & P valve on the side is not a good fit for ZeroEnergy. You won't get the full amount of natural water circulation needed. Thanks again!

Do you make a unit that takes the waste heat from a home a/c unit and transfers it to an existing...

Asked by Olive September 4, 2019

Good afternoon. We do not have a heat exchanger that works with a pool pump or chlorinated water. Thanks anyway for your inquiry.

I am heating and cooling with a Mitsubishi minisplit. In the winter, I would want my room heating...

Asked by MaudSTL August 22, 2019

Hi. As discussed, the heat recovery process will only minimally affect your AC system during heating season (i.e., when the heat pump is running). Thanks!

what happens in the winter time ans no ac running

Asked by Hank August 5, 2019

Hi Hank. If you have a heat pump AC system, there is still some hot water creation during heating season. The refrigerant is not as hot but you will still be receiving some of the free hot water benefits with the heat exchange. Please call or email if I can answer any more questions. Thanks Mark 484-255-4653

I researched a similar unit but couldnt find A company to install anywhere in san diego. Do you h...

Asked by edwalls1 April 25, 2019

Good morning. We have a very detailed installation manual and we teach certified HVAC installers how to install Zero Energy quite often. If you send me your email address, I'll be happy to provide you with the manual. We will then be available to speak with your installer when ever you need us. Thanks! Mark gonegreenearth@live.com cell: 484-255-4653

What makes sure that the temperature doesn't reach the danger level besides just the blow off val...

Asked by JJ April 7, 2019

Hi JJ. There are several points needed to respond to your question: 1) We recommend you install a mixing valve (also known as an anti-scald valve) that's part of the install kit (sold separately on homedepot.com). 2) Once all of the water in your storage tank is the same temperature, the thermosiphon or natural circulation of the water created by the design of ZeroEnergy stops 3) The heat exchange only occurs when the AC is running. I hope this helps but please call 484-255-4653 or email gonegreenearth@live.com if you need more info. Thanks....Mark

Can this product be connected 2A pool

Asked by Tom March 2, 2019

Not that i know of.

Would this work on a ductless a/c mini split heat pump?

Asked by cyn January 22, 2019

Good Evening. We have installed ZeroEnergy with many mini-split systems. Just to check, please send the make and model number then we'll verify compatibility. gonegreenearth@live.com 484-255-4653. Thanks...Mark

I would like to get one of these units but so far I cannot find anyone to install the unit. Does...

Asked by Pat January 4, 2019

Hi Pat. Thanks for your question. We do have an installer in Miami who covers certain counties. Also, the install guide is very comprehensive and we train new installers via the phone all the time. Please call me or send your phone number and I'll be happy to follow up with you. Thanks again...Mark gonegreenearth@live.com 484-255-4653

Heat Recovery Water Heater System - Zero Energy - page 2

Customer Reviews

  • 5
    out of 5 reviews
  • 100% recommend this product
Filter by:
Showing 1-5 of 5 reviews
We installed this heat recovery unit on to a 2.5 ton Air Conditioner heat pump condenser and plum...
We installed this heat recovery unit on to a 2.5 ton Air Conditioner heat pump condenser and plumed it into a New Rheem 85 gallon Marathon Commercial electric water outside a home ( where a small room will be built over the water heater ) and within about and hour with the air conditioner running we had 139 F degree hot water temperature on a hot water faucet before we installed the anti scald valve in the house and the power turned OFF feeding the water heater. So it seems as long as the Air Conditioner runs a few hours a day the water heater elements will probably not even turn on and with the Marathon water heater there is very little heat loss the tank itself will hold hot water for days after its heated. Hot water out temperature at the ZeroEnergy unit 143 F degrees, Hot gas in temperature at the ZeroEnergy unit 181 F degrees. The current pull on the Air Conditioner was reading 11.2 amps to start after installing the ZeroEnergy unit on to the existing system the Amp Draw went down to 9.3 which in theory turned this 13 seer heat pump into a around a 15 seer system plus free heated water. Over all ZeroEnergy water heater system is a great idea and a big energy saver and with a Marathon water heater makes even more better and efficient. Steve Buggay Heating Air Conditioning Refrigeration, Ga Lic CR109488 706-789-3486 Danielsville Ga. 30633.
by Cannon
9 people found this helpful
It works great, free water!...
It works great, free water!
by joy
2 people found this helpful
ZeroEnergy -- No hassle and great savings!!!
We have had a ZeroEnergy unit installed in our home in Florida since 2009. It has saved us money and has been a no-hassle addition to our established systems! We are thrilled with ZeroEnergy and would definitely recommend it to others!!! - Sarah
by HappyCustomer
5 people found this helpful
Great Product
Got this product and I can see how much money I can save. I am thankful about this product and will have extra cash to spend
by Saver
5 people found this helpful
Great Product!!
It was very easy to install and works great. It has basically paid it self off already
by Johhny
8 people found this helpful
Showing 1-5 of 5 reviews