The iHeat HS-4 is a feature-rich tankless water heater intended for point-of-use applications such as under-sink, booster, or very low-flow rate showers in warm climates. Use in boats, apartments, hospitals, condos, cabins, studios, clinics, schools and pool houses.
High-performance, small-package features
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• IXP4 Water proof enclosure, allows for under-counter installations.
• Flow sensor activated
• No stand-by heat loss compared to tank water heaters
• Saves up to 50% on energy consumption with the 99% EF
• No wating for heated water. Heats water instantly and never runs out of heated water.
• High limit safety temperature switch. Easily resets manually.
• Horizontal pipe design eliminates air from water line (no dry firing to damage elements)
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• Temperature display rotates with a touch of the button for upside down installation and easy to use temperature zones.
• Set the temperature from 80°F to 129°F. Output temperature is not guaranteed, and depends on flow rate and incoming water temperature. Display shows the temperature setting and actual water output temperature while water is flowing.
• Conveniently includes connected conduit wire for easier electrical installation
• Incoloy field-replaceable heating elements. Resists hard water and sediment build up.
• Closed Loop Modulation™ measures water flow, inlet and outlet water temperatures 60 times per second to ensure precise temperature constantly
• Outlet pipe reduced to meet minimum delta Δ temp rise.
• Can be connected to a hot water feed or cold water feed, making it ideal for booster applications
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Warranty
• Heat exchanger: 5 years
• Internal Components: 3 years
• Heating Elements: 1 year
Tank vs. Tankless Heaters
| Descriptions |
40 Gallon Tank |
Tankless Heater |
| Estimated Lifespan |
10 Years |
20 Years |
| Energy Efficiency |
0.85 EF |
0.99 EF |
| Hot Water Supply |
70% of Capacity |
Endless Supply |
| Kilowatt Usage / Yr. |
4857 Kw/Hrs. |
2618 Kw/Hrs. |
| Heat recovery |
Yes |
No |
| Standby Loss |
20% |
No Loss |
| 12 Month Operation Cost |
$556.00 |
$309.00 |
Specifications
| Dimensions |
11" x 6.5" x 3" |
| Weight |
5.2 lbs. |
| Cover |
Brushed 304 Stainless Steel, IXP4 water proof |
| Body/Heat Exchanger |
ASTM 304 Stainless Steel |
| Element |
One 1.5" Brass Plug / Incoloy |
| Pipe fittings |
1/2" NPT |
| Activation flow rate |
0.33 gallons per minute |
| Operation Pressure |
25 to 150 PSI |
| Certifications |
UL-499, CSA, NSF.372 Lead Free |
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Temperature in °F at given flow rates |
| Model |
KW |
Volts |
Amps |
Breaker
size |
HZ |
AWG# |
Current
Phase |
0.5
GPM |
0.75
GPM |
1.0
GPM |
1.5
GPM |
| HS-4 (this page) |
3.5 |
120V |
28 |
30 |
50/60 |
10-2 |
Single |
44 |
33 |
23 |
- |
| HS-7 |
7 |
240V |
29 |
30 |
50/60 |
10-2 |
Single |
95 |
71 |
48 |
31 |
Documentation
User and Installation Manual
Product Specifications
Product Warranty
Frequently Asked Question ("FAQ")
Q: If the power goes out, will I need to reset my output temperature setting?
A: Yes.
