Operator`s manual
PUREHEAT™ HYDRONIC AIR HEATER OPERATOR’S MANUAL – SECTION 1 
V. 2, Rev. 09/01/06  © 2006 Ground Heaters, Inc.  1- 1 
INTRODUCTION 
The Pureheat™ Hydronic Air Heater provides temporary air heat, thaws frozen ground, cures concrete 
and provides frost prevention at ambient temperatures below 40°F (5°C). Ground Heaters, Inc.’s 
revolutionary technology enables construction activities to continue throughout the cold weather months. 
The Pureheat™ Hydronic Air Heater is equipped with a 5-Port On-Board Manifold and 1,000 ft (396 m) of 
1 in. (25 mm) ID Red Circulation Hose Assemblies with Quick-Connects (QCs). The standard equipment 
package includes the following lengths of Circulation Hoses: Two (2) 200 ft (61 m), Four
 (4) 100 ft. (30 m ), 
Four (4) 50 ft (15 m)
. The optional diesel or gas Burner heats the Heat Transfer Fluid (HTF) to 180°F 
(82°C). The HTF is continuously circulated through the Circulation Hoses in a vented, closed-loop 
system. 
With standard equipment, the Pureheat: 
(Refer to Appendixes B and C) 
•  Provides remote space heating for up to 1,200,000 ft
3
 (48,235 m 
3
) of building space. 
Using GHI’s optional Booster Pump and Auxiliary Pump Panel, Three (3) Hose Handling System 3004 
(HHS3004) with Twelve (12) 750 ft (228 m) 5/8 in. ID Heat Transfer Hoses (HTH) and three 4-Port 
Remote Manifolds, the Pureheat will: 
• Thaw
 up to 18,000 ft
2
 (1,674 m
2
) of frozen ground per application using 24 in. (60 cm) hose 
spacing. 
• Thaw
 up to 9,000 ft
2
 (837 m
2
) 75% to 100% faster using 12 in. (30 cm) hose spacing 
Using GHI’s optional Booster Pump and Auxiliary Pump Panel, Five (5) Hose Handling System 3004 
(HHS3004) with Twenty (20) 750 ft (228 m) 5/8 in. ID Heat Transfer Hoses (HTH) and Five (5) 4-Port 
Remote Manifolds, the Pureheat can: 
• Cure
 all types of concrete placements, including slabs on grade, elevated slabs, tilt-up walls, 
poured walls, columns, footings, bridge decks, etc. up to 30,000 ft
2
 (2,790 m
2
) per application 
using 24 in. (60 cm) hose spacing. 
•  Provides Frost Prevention
 up to 45,000 ft
2
 (4,186 m
2
) per application using 36 in. (91 cm) hose 
spacing. 
The Pureheat™ Hydronic Air Heater Model Pureheat: 
• Heats
 workspace easily & economically: 
•  Input of 860,000 BTUH. 
•  Fuel flexible; choice of natural gas, propane or diesel. 
•  Takes only minutes to change over from one fuel to another. 
•  Provides pure, dry, hot air
 – no moisture added to workspace; prevents mold and mildew. 
•  Removes excess moisture
 – dry / warm air removes moisture from workspace and building materials. 
•  Provides pure, clean air
 – no combustion by-products in workspace. 
• Is self-contained
 – all system components are on One (1) trailer. 
•  Is rental friendly
 – easy setup and uses only One (1) 15 amp. And One (1) 20 amp. 120 volts AC 
circuits. 
• Is multi-functional
 – with accessories, this system can be used as a surface heater. 










