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Eccotemp 45H NG Outdoor Tankless Water Heater


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Eccotemp 45H Outdoor 6.8 GPM Natural Gas Tankless Water Heater

The Eccotemp 45H-NG is the largest outdoor model of the Eccotemp tankless line. Rated at an impressive 6.8 GPM and 140,000 BTU per hour, the 45H-NG can meet all the hot-water needs of a standard home or apartment with one or two bathrooms, as well as smaller commercial applications.


The compact, wall mounted 45H-NG is powered by natural gas and is also split system adaptable, which can further increase efficiency and hot water delivery speed. With its fully automated control system, the Eccotemp 45H-NG is the ideal choice for any standard sized home.


Here is a YouTube link and a couple of downloadable PDF files. We hope these will answer any questions you may have.  However, if you have other questions not cover here, please contact us. 


45H Manual
Eccotemp Introduction
45H Warranty



Up to 150,000 BTU, 110V power supply


  • Water Fittings: 3/4" NPT, Inlet and Outlet, Non-Restrictive.
  • Gas Fitting: 3/4" NPT 

Flow Rate:

  • 35 degree rise: 6.8 GPM
  • 50 degree rise: 5.0 GMP
  • 70 degree rise: 3.4 GMP

Additional Features

  • CSA certified for US and Canadian use
  • Natural Gas Powered
  • Digital remote with simple controls and diagnostics
  • 110 volt UL listed power cord
  • 140,000 BTU
  • Outdoor Installation, no venting required
  • Energy Factor: 0.80
  • 10 year warranty on heat exchanger
  • 5 year warranty on parts
  • Energy rating: 82%
  • Hot water capacity range: 1.2 - 6.8 GPM
  • Activation flow rate: 0.8 GPM
  • Maximum / Minimum gas rate: 19,800 - 140,000 BTUs
  • Product dimensions & weight: 15"X 5"X 24" & 38 lbs.
  • Easy Installation

Energy Guide

What's included in the Box

  • 1 X 45H Natural Gas Tankless Water Heater 
  • 1 X Temperature and Pressure Relief Valve
  • 1 X Hardware Pack
  • 1 X Instruction Manual        

IMPORTANT NOTE: Not recommended for elevation above 3000 ft and cannot be used for HYDRONIC SYSTEM, RECIRCULATING or FLOOR HEATING.

***Please Note: Failure to clean and descale your water heater quarterly can result in Lime and Sediment build up within the heater, which can void your warranty! We recommend using our Eccotemp EZ-Flush System Descaler Kit to ensure a clean, energy efficient, long lasting heater!  For more information, please contact us. 


CSA 2714806 Class 2901 85 Class 2901 05 Class 2902 93 Class 2902 13

*Authorized Dealer*

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  • Model: 45H NG
  • Shipping Weight: 40lbs
  • 10 Units in Stock
  • Manufactured by: Eccotemp

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This product was added to our catalog on Thursday 31 January, 2019.