#1 Home Improvement Retailer

Internet #204118995

Model #SMART 40

36 Gal. Indirect Hybrid Electric Water Heater

  • 3x quicker heating than standard gas/electric water heaters
  • Corrosion-resistant stainless steel construction for longevity
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
  • View More Details
How to Get It

Product Overview

There are two major types of water heaters, those with coils and the twin walled tank. The water heater which we manufacture, the Tank-in-Tank, doesn't fall within either of these categories. The difference between our water heaters and those with coils is clear since in the former the primary fluid heats the domestic hot water from the outside while the other heats it from the inside out. On the other hand the twin walled water heaters have an area near the bottom which is not heated and the heat transfer surface is smaller than in the Tank-in-Tank.
  • Stainless steel was chosen for its well established reliability and advantages over other materials
  • Most important characteristic of the Tank-in-Tank system is its capability for auto-descaling
  • Long life expectancy combined with the reduced requirement for regular maintenance
  • Stainless steel, as its name suggests, is resistant to corrosion
  • Exclusive "Tank-in-Tank" Design
  • Self cleaning / self descaling heat exchanger
  • 3 Times faster than conventional gas or electric water heaters
  • 2 in. Polyurethane Foam insulation
  • Residential limited lifetime warranty
  • Lowest pressure drop in the industry
  • Click here to check out our buying guide on water heaters
  • Click here for more information on Electronic Recycling Programs
  • California residents

Additional Resources

From the Manufacturer

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



Product Depth (in.)
22 in
Product Height (in.)
46 in
Product Width (in.)
22 in
Tank Valve Size (in.)
1 in
Water Connection Size (in.)
3/4 in


Application Type
Finish Family
First Hour of Delivery (gallons/hr)
Fuel Type
Maximum Temperature (F)
90 °F
Minimum Heat Pump Temperature (F)
90 °F
Minimum Temperature (F)
90 °F
Nominal Tank Capacity (gallons)
0 gal
Pack Size
Product Weight (lb.)
135 lb
Rated Tank Capacity (gallons)
36 gal
Required Volt Connection
120 volt
Tank Lining Material
Stainless Steel
Tank Warranty
1 Year
Uniform Energy Factor
Water Heater Features
Self Cleaning
Water Heater Profile
Wattage (watts)
0 W

Warranty / Certifications

Certifications and Listings
ETL Listed
Labor Warranty
No Warranty
Part Warranty
No Warranty

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 3
    out of 4 reviews
  • 33%recommend this product
Filter by:
Showing 1-4 of 4 reviews
I bought this because it’s what I already had and...
I bought this because it’s what I already had and thought pipe connections would all line up. They moved the furnace connections and had to repipe those. I like heater but hard to find good temp setting. Temp swing is big. Definitely add temp control valve after heater.
  • Verified Purchase
As one reviewer stated.....Garbage
The first unit started leaking within a few years. I’m on my second unit, which was replaced through their horrific warranty. 2 years later it’s starting to leak again. Avoid this unit!!!!!!
    6 found this review helpful
    Garbage failed within 2 yrs and Triangle Tube won't honor warranty , it's the second one that fai...
    Garbage failed within 2 yrs and Triangle Tube won't honor warranty , it's the second one that failed their boilers are problematic also, horrible customer service buy another brand!!!
      5 found this review helpful
      I love this product very high efficient.
      I love this product very high efficient.
      • Verified Purchase
      • Recommended
      3 found this review helpful
      Showing 1-4 of 4 reviews