Shanghai Jastar Industrial Co., Ltd.
Instant · 3-stage power 8,000 W 220 V 30 – 55 °C OEM / ODM

8 kW Instant Electric Water Heater — Three-Stage Variable Power, 3 / 5 / 8 kW

A three-stage point-of-use heater: 3,000 W, 5,000 W or 8,000 W selected on the knob. One SKU covers older wiring and new builds, and the outlet is held between 30–55 °C once water flows. 8 kW element, rotary control, no plug — wired to the 40 A leakage breaker supplied in the box.

Model
GB-3
Rated power
8,000 W (3,000 / 5,000 / 8,000 W)
Voltage / Frequency
220 V ~ · 50 / 60 Hz
Heating element
Stainless steel cup, 8 kW
Hot water in
≈ 2 seconds
Temperature range
30 – 55 °C
Control
Rotary knob
Power cable
≥ 6 mm² copper core
Power connection
No plug · 40 A leakage breaker supplied
Unit size
220 × 88 × 270 mm
Carton
12 pcs · 645 × 310 × 500 mm · 24 kg

MOQ 100 pcs for custom panel colour, pattern and logo · 1,000 pcs for custom packaging. Samples from 1 pc — the sample price is higher than the bulk price, and we refund the difference once you place a bulk order within 30 days of receiving the sample. Prices are quoted per order, EXW Shanghai — tell us your quantity and destination port and we will reply within one working day.

CE RoHS 100% tested before shipment

Why this model

One model, three power stages

A single SKU that can be sold into weak and strong supplies alike.

3 / 5 / 8 kW on one knob

3 / 5 / 8 kW on one knob

Three stages let the installer match the heater to the cable and breaker actually present on site, instead of forcing an upgrade before the unit can be used.

8 kW element, two seconds

8 kW element, two seconds

The stainless steel cup element heats on demand and delivers water in about two seconds, so a shower runs without a storage tank in the loft.

Compact 220 × 88 × 270 mm body

Compact 220 × 88 × 270 mm body

A smaller footprint than the 8.8 kW models in this series, with a 24 kg carton of 12 — useful where wall space or freight budget is the constraint.

Protection first

Protection first

Water and electricity stay separated, with over-temperature, dry-heat and leakage protection, plus the 40 A breaker in the box.

Specifications

Technical data — GB-3

Every unit is pressure-tested and function-tested before packing. Custom panel finish and power connection available for OEM orders.

Electrical & performance
Rated power8,000 W (stages: 3,000 / 5,000 / 8,000 W)
Rated voltage220 V ~ · 50 / 60 Hz
Heating elementStainless steel cup, 8 kW
Heating time≈ 2 seconds
Temperature range30 – 55 °C
ControlRotary knob
Power cable≥ 6 mm² copper core
Power connectionNo plug · wired direct, 40 A leakage breaker supplied
ProtectionWater–electricity separation · Over-temperature protection · Dry-heat protection · Leakage protection
Waterproof ratingIPX4
CertificationCE · RoHS
Water, dimensions & packing
Unit size220 × 88 × 270 mm
Inner box245 × 105 × 295 mm
Pcs per carton12 pcs
Carton size645 × 310 × 500 mm
Gross weight24 kg
Body colourWhite (custom on request)
LoadingLCL and FCL both available

OEM & ODM

Make it your own brand

We build for importers, wholesalers and own-brand retailers — from a panel colour change to a fully customised product and gift box.

Panel colour, pattern & logo

Body colour and front panel in your colour and pattern, with your logo printed or laser-etched. Artwork proof before mass production.

MOQ 100 pcs

Packaging

Custom printed inner box and master carton, colour or gift box, barcode and retail labelling. Export cartons are drop-tested.

MOQ 1,000 pcs

Power connection

Plug standard (EU / US / UK / AU / Africa) and cable length matched to your market. Shower set included or optional as listed above.

No extra MOQ

Documents & certification

CE and RoHS test reports, product photos, specification sheets and packing lists for your own listings and customs clearance.

Ready to share

Samples & price protection

Test one unit before you commit to a container

Every model is available as a sample, and every price step you reach is paid back to you — the sample itself included.

Samples from 1 pc

Order a single unit to test it, open it up and show your own customers. No minimum quantity, any model in the range, shipped with its CE and RoHS test reports.

MOQ 1 pc

The sample price difference comes back

A single unit is charged above the bulk price, because of one-off handling and air freight. Place a bulk order for the same model within 30 days of receiving the sample and we refund the difference.

30-day rebate

Earlier shipments are rebated too

Our four price tiers — 10–99 / 100–999 / 1,000–9,999 / 10,000+ pcs — are counted cumulatively over the 30 days after you receive the goods. Reach a higher tier and we refund the difference on the units you have already shipped.

Cumulative over 30 days

Tell us which model you want to test and we will send the sample invoice the same working day.

Request a quotation for GB-3

Send us your quantity, destination port and power connection requirements — we will come back with prices and lead time within one working day.

Product Catalog 2026

Browse the full range — instant water heaters, hot water taps and bathroom & desk heaters — in one PDF.