Hazloc Heaters HUH2 Hydronic Unit Heater – Industrial Heaters

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Hazloc HUH2 Explosion Proof Hydronic Unit Heater

Hazloc HUH2 Hydronic Unit Heater

hydronic unit Heaters

Hazloc HUH2 hydronic unit heater is an industrial grade heater specifically designed to meet the harsh requirements of the oil and gas industry.

The heaters are safe, reliable and dependable to be used for applications within pulp & paper mills, power generation, mining, steel mills, foundries, water and wastewater treatment plants, chemical plants and hazardous material storage facilities.

Hazloc HUH2 industrial heaters are simple to use and are designed to ASME requirements for steam applications with maximum operating pressures up to 400 PSIG (2758 kPa).

Industrial Grade Heaters by Hazloc

Industrial Grade Heaters by Hazloc

Hazloc Heaters HUH2 Heater

Product Benefits

There are 6 sizes of Hazloc HUH2 heater available, all featuring the Hazloc SafeDeform top and bottom core headers.

The SafeDeform headers are designed to deform the increased volume due to ice expansion, during freezing conditions – this enables the Hazloc HUH2 heaters to be frozen several times without suffering any critical damage.

The range features single or three phase heaters with general purpose or explosion proof motors.

Voltages range from 115V to 575V and fan sizes from 12″ to 36″.

Standard Marathon NEMA explosion-proof motor is suitable for Class I & II, Div. 1 & 2, Groups C, D, F & G; T3B; Maximum ambient air temp of 40°C.

Key Features of Hazloc Heaters HUH2

Hazloc HUH2 hydronic unit heater is dedicated to providing the safest industrial heating in the most challenging areas and applications. Key product features provide unbeatable performance, reliability and safe heat when it is needed. These features include:

Extra Strength – metal rivets in the top panel provide extra strength

Durability – 14 gauge steel cabinet construction is covered in a epoxy coating for added durability

Safe Or Hazardous Areas – angle of general purpose or explosion proof motors are available

Air Flow Control – aluminium louvres attached to dimpled cabinet panels for easy control of air flow direction

Long Life – 16-gauge (0.065 in.) tension-wound aluminium fin tubes for longer life

Hazloc Heaters HUH2 explosion proof hydronic heater product features

Hazloc Heaters HUH2 Hydronic Unit Heater | Product Features

Hazloc Heaters HUH2 hydronic unit Heater

Technical Specifications

ApprovalCRN: 0H14933.2C – steam or fluids (not for use with lethal fluids as defined by ASME, Section VIII, Div. 1, UW-2).
Maximum pressure rating400 psig (2758 kPa).
Maximum temperature rating550 °F (288°C).
Minimum design metal temperature-20° F (-29° C)
Cabinet material14-gauge (0.075 in.) (1.9 mm) steel. HUH2-36 is 12-gauge (0.105 in. (2.7 mm) steel on top and bottom panels and motor mount. Yellow epoxy/polyester powder coated with five-stage pre-treatment, including iron phosphate. Optional Heresite phenolic coating available. Option Codes H2 or H3 (includes Heresite coating of louvres & fan blade).
Louvre bladesAnodised extruded aluminium.
FanSpark-resistant three-blade aluminium (except HUH2-30 which is two-blade and HUH2-36 which is six-blade).
Fan shroudSpark-resistant aluminium
Fan guardSplit design with close wire spacing. A 3/8 in. (9.5 mm) diameter probe will not enter.
Motor driveThermally protected CSA or UL Listed 1725 RPM permanently lubricated ball bearing type with 56 frame and “easy-off” fan blade replacement feature.
HUH2-36 is a 56C frame motor and a maintenance-free speed reducer.
Mounting holes5/8 in. – 11 UNC – 4 holes at top of heater (2 holes, HUH2-12)
Fluid connections2 in. NPT female inlet and outlet (configuration of fluid connection locations can be reversed by rotating the core). Other thread-on connection types are available.
They are shipped loose and must be installed on site. See Option Codes C2 or C3. (C3 connection also includes C2 connection).
Header material12 gauge (0.105 in.) (2.7 mm) and 3/16 in. (4.8 mm) carbon steel conforming to ASME requirements.
Finned tubes5/8 in. (15.9 mm) outside diameter [16-gauge, 0.065 in. (1.6 mm) wall thickness] carbon steel tubes with 1-1/2 in. (38.1 mm) outside diameter copper-free, L-foot, tension-wound aluminium fins @ 10 fins per in.
Exchanger coatingsStandard coating is a black, high-heat enamel paint. Optional Heresite phenolic coating available.
Option Codes H1 or H3.

➡ Contact T&D for specifications on EAC Ex marked heaters.

Hazloc Heaters HUH2 Explosion Proof Heaters

Hazloc Heaters HUH2 Industrial Heaters

Hazloc HUH2 – Product Range

Hazloc HUH2 Part NumberHUH2-12HUH2-16HUH2-20HUH2-24HUH2-30HUH2-36
Fan diameter in. (mm)12 (304.8)16 (406.4)20 (508.0)24 (609.6)30 (762.0)36 (914.4)
Air delivery* cfm (m3/hr)1090 (1852)1650 (2803)3000 (5097)3800 (6456)5500 (9344)8350 (14186)
Approx. air velocity* fpm (m/s)1305 (6.6)1111 (5.6)1309 (6.6)1138 (5.8)1066 (5.4)928 (4.7)
Air throw* @ 15 psi steam ft (m)45 (13.7)65 (19.8)70 (21.3)80 (24.4)85 (25.9)70 (21.3)
Motor power hp (watts)1/4 (186) or 1/3 (248)1/2 (373)1/2 (373)3/4 (559)1 (746)
Rec. min. mounting height ft (m)7.5 (2.3)7.5 (2.3)7.5 (2.3)7.5 (2.3)7.5 (2.3)7.5 (2.3)
Net weight lbs (kg)78 (35.4)97 (44.0)132 (59.9)206 (93.4)264 (119.7)491 (222.7)
Approx. shipping weight  lbs (kg)128 (58.1)149 (67.6)190 (86.2)271 (122.9)339 (153.7)603 (273.5)

* At 70°F (21°C), 60 Hz and sea level.

Hazloc Heaters - Hazardous Area Electrical Heating Equipment (ATEX IECEX CSA)

Hazloc Heaters – Heating Equipment


Hazloc Heaters are global suppliers and manufacturers of industrial and explosion-proof heaters and thermostats for hazardous areas and severe duty locations – this includes industrial heating products for non-hazardous and severe-duty applications. Explosion proof and hazardous area certifications include North American (NEC & CE), International (CENELEC & IEC), European (ATEX) and Russian EAEU (EAC EX).

Heating Hazardous Areas With Electrical Heaters

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