JGS Boiler & Water Immersion Heater

JGS 型锅炉用管状电热元件

Immersion heating assembly for boiler feed and circulating hot water to 160 °C. 20# steel, 304, 316 or 316L tube, supplied as a flange-mounted bundle or a threaded single element.

Max medium temperature: 320 °F(160 °C)
Power range: 1 – 45 kW
Voltage: 220 / 380 V, 50 Hz
Sheath material: 20# steel, 304 stainless, 316 stainless, 316L stainless
Medium: Water, Steam
Mounting: Flange, Threaded boss
Tube diameter: 0.472–0.63 in
Pressure rating: 116–580 psi

Lead time: 18–30 days
MOQ: 5 units
Pricing: On application

Design notes

Flange or threaded mount, sealed for 0.8–4 MPa

JGS assemblies heat water inside a pressure vessel — a hot-water boiler, a calorifier, a buffer tank or a steam generator shell. The heated element is the same tubular construction used across the range; what changes is the pressure boundary. A machined flange with a gasket face, or a threaded boss with a sealing washer, carries the seal and the assembly is hydro-tested before dispatch.

Material choice follows water chemistry rather than temperature. 20# carbon steel is adequate for closed, chemically treated circuits where oxygen is scavenged and make-up is minimal. Open circuits, softened water, and anything with meaningful chloride content should go to 304, and 316 or 316L where chlorides are high — a stainless immersion heater in the wrong grade pits along the waterline faster than carbon steel would.

The other design decision is scale. Hard water deposits carbonate on the sheath, and like carbon in oil it insulates: the element runs hotter under the deposit until the coil fails. In hard-water regions specify a lower watt density and plan for descaling access, or feed the vessel through a softener.

Features

Sealed installation rated 0.8 – 4 MPa
20# steel, 304, 316 or 316L sheath to suit water chemistry
Flange-mounted bundles or threaded single elements
Bundle assemblies from 3 kW to 45 kW at 220 V or 380 V, 50 Hz
Hydro-tested and megger-tested before dispatch

Typical applications

Electric hot-water boilers and calorifiers
Steam generator shells
Process water and CIP tank heating
District and buffer-tank top-up heating
Freeze protection on outdoor water vessels

North American build options

Voltage: 120 / 208 / 240 / 277 / 480 / 600 V @ 60 Hz
Threads: NPT or BSP cut to order
Flanges: ANSI B16.5 150# / 300#
Drawings: Issued in inches on request

These are build options, not stock items — the catalog part numbers above are 50 Hz with metric fine threads. State what you need on the RFQ.

Part numbers & dimensions

13 catalog part numbers in the JGS series

Part number	Voltage	Power	Notes
JGS-220/3-FL	220 V	3 kW	Flange bundle, 3 elements
JGS-380/6-FL	380 V	6 kW	Flange bundle, 3 elements
JGS-380/9-FL	380 V	9 kW	Flange bundle, 3 elements
JGS-380/12-FL	380 V	12 kW	Flange bundle, 6 elements
JGS-380/15-FL	380 V	15 kW	Flange bundle, 6 elements
JGS-380/18-FL	380 V	18 kW	Flange bundle, 6 elements
JGS-380/24-FL	380 V	24 kW	Flange bundle, 9 elements
JGS-380/30-FL	380 V	30 kW	Flange bundle, 9 elements
JGS-380/36-FL	380 V	36 kW	Flange bundle, 12 elements
JGS-380/45-FL	380 V	45 kW	Flange bundle, 12 elements
JGS-220/1-TH	220 V	1 kW	Threaded single element
JGS-220/2-TH	220 V	2 kW	Threaded single element
JGS-220/3-TH	220 V	3 kW	Threaded single element

Bundle assemblies are configured per order: flange standard and size, element count, sheath grade, terminal enclosure and thermostat pocket are all set at drawing approval. Send your flange detail with the inquiry.

Minimum order quantity for this series is 5 units. Dimensions switch between millimetres and inches with the unit toggle in the header.

Full specification

Sheath material: 20# steel, 304, 316 or 316L stainless
Max. water temperature: 160 °C
Sealed pressure rating: 0.8 – 4 MPa
Mounting: Machined flange or threaded fastening boss
Assembly power: 3 – 45 kW typical bundle
Voltage: 220 V or 380 V, 50 Hz
Terminal seal: Silicone with optional IP54 terminal box
Insulation resistance: ≥ 1 MΩ at 500 V DC
Standard: JB/T 2379-93

Questions engineers ask

Do I need stainless steel, or will carbon steel do?

It depends on the water, not the temperature. Closed, chemically treated circuits with scavenged oxygen and little make-up run fine on 20# carbon steel. Open circuits, softened water and anything carrying chloride should be 304, moving to 316 or 316L as chloride rises. Getting this wrong shows up as pitting along the waterline within months.

How does hard water shorten element life?

Calcium carbonate deposits on the sheath and insulates it. Heat that used to leave into the water is now trapped, so the coil temperature climbs under the scale until it fails — the element is destroyed by its own output. In hard-water areas specify a lower watt density, leave descaling access, or soften the feed.

What pressure rating can you seal to?

Standard flange and threaded builds seal from 0.8 to 4 MPa, and every assembly is hydro-tested before dispatch. Send us the vessel's design pressure and the flange standard you work to — DIN, ANSI, JIS or GB — and we will match the mating face rather than supplying a flange you then have to adapt.

Can you fit a thermostat or thermowell into the assembly?

Yes. A thermowell in the flange face, a capillary thermostat pocket, or a bulb well positioned in the bundle are all standard options. Say what control device you intend to use and we will place the pocket where it reads the water rather than the sheath — a common installation error that makes control hunt.

Watt-density figures and temperature limits on this page are design guidance, not warranties. The safe value for your installation depends on the medium, its flow and how the element is mounted — which is why we ask for the duty rather than only the part number.

Commonly specified with