 Helio-Flo Heat Transfer Appliance for Open 
Loop Systems
Helio-Flo Heat Transfer Appliance for Open 
Loop Systems
The Helio-Flo (HFLO) is an all-in-one heat 
transfer appliance designed for use in open loop systems or in conjunction with 
a closed loop integrated tank system, making it quite versatile for solar water 
heating applications.  The Helio-Flo (HFLO) comes assembled with pump, 
standard or advanced controller, two sensors and two temperature gauges.
Product Features
• Efficient 
direct water circulation
• "Plug & Play" 
installation
• Sleek modern design
• Pro controller option
• 
Compact assembly
• Easy tank/wall mounting 
bracket included
• DC version includes 
20W PV panel
Helio-Flo Heat Transfer Appliance comes assembled 
with:
• Delta-T, 
Delta-T Pro or Delta-T Pro Lite controller with collector/tank sensors 
(2)
• 2 combo valves
• Pump
• Easy tank/wall 
mounting bracket included
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DELTA T CONTROLS:
Delta T Standard 
• 
Programmable for open loop or closed loop 
• 
2 thermistor sensors
• 2 relays
The Helio-Flo PRO upgrade  further enhances the 
residential solar hot water system, with the addition of user-friendly 
customizable settings, remote navigation, and expanded system performance 
data.

Delta T Pro Lite 
• 
Programmable for open loop or closed loop 
• 
2 thermistor sensors
• 2 relays
• Remote Wi-Fi system 
navigation
• BTU 
metering
• Stored 
energy data (BTU, °F, GPM)
• 
Adjustable user settings
• Vacation 
mode
Delta T Pro
• 
5 program configurations available:
  (OL DHW, CL DHW, Pool, 
Space, Commercial)
• 5 thermistor 
sensors
• 3 relays 
• Remote Wi-Fi system 
navigation
• BTU 
metering
• Stored 
energy data (BTU, °F, GPM)
• 
Adjustable user settings
• Vacation 
mode
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 HFLO 016 100 
Off-grid model 
includes:
HFLO 016 100 
Off-grid model 
includes:
• DC 
Controller
• DC Pump
• 20W PV Panel
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HFLO 016 000 Standard
• 16,000 BTU
• 
110AC
• Delta T Standard Control
• 
For up to 96 sq ft of GOBI collector area
• 
Includes check valves
• Top tank connection
HFLO 016 002 Pro Lite
• 116 BTU
• 
110AC
• Delta T Pro Lite Control
• 
For up to 96 sq ft of GOBI collector area
• 
Energy Metering
• Includes check valves
• Top tank connection
HFLO 048 011 PRO Commercial*
• 48,000 BTU
• 
240V
• Delta T PRO Control
• 
For up to 320 sq ft of GOBI collector area
• 
Energy Metering
• Includes check valves
• Bottom tank connection
HFLO 016 100 PV/DC 
• 
16,000 BTU
• DC
• Delta T Standard Control
• For up to 96 sq ft of GOBI collector area
• Includes check valves
• 
PV Panel
• Top tank connection
HFLO 016 210 - 240AC
• 16,000 BTU
• 
240AC
• Delta T Standard Control
• 
For up to 96 sq ft of GOBI collector area
• 
Energy Metering
• Includes check valves
• Bottom tank connection
*The HFLO 048 011 can be parallel plumbed to accommodate up to 24 x 410 
collectors.
| Helio-Flo Heat Transfer Appliance 
Specifications | 
| Model | Heat transfer
 rate 
(BTU)
 | Voltage | Control | Max. 
collector area
 | Energy 
Meter-ing | PV 
Panel | Pipe Conn-ection
 | 
| HFLO 016 000 | 16,000 | 110 AC | Delta T Standard | 96 sq ft | - | - | top | 
| HFLO 016 002 | 16,000 | 110 AC | Delta T Pro Lite | 96 sq ft | yes | - | top | 
| HFLO 016 210 | 16,000 | 240 AC | Delta T Standard | 96 sq ft | yes | - | bottom | 
| HFLO 048 011 | 48,000 | 240 AC | Delta T PRO | 321 sq ft | yes | - | bottom | 
| HFLO 016 100 | 16,000 | DC | Delta T Standard | 96 sq ft | - | yes | top | 
Download » HFLO Technical Specifications
Product Manufacturer: 
Heliodyne
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HELP 
» Contact Customer Support
• 
Toll-Free help line offering system selection 
support
_________________________________________________
Delivery Information: Please allow 2 to 10 
business days for
orders to be processed, plus standard transportation 
delivery time.