A tankless heater lives or dies on two things: the weld that holds 1.2 MPa of water pressure, and the leakage current after months of thermal cycling. We pressure-test and wet-test every body — not a sample out of the batch.
Request a Quote WhatsApp
Ranges we hold every day. Anything outside them is possible — it just needs a conversation before the drawing.
| Power | 2 / 3 / 4.5 / 5.5 / 6 / 7 / 8 / 9 kW per body · 220–240 V single phase, 380 V 3-phase on request |
|---|---|
| Construction | Stainless chamber with built-in tubular element · die-cast aluminium body with embedded element · multi-chamber serial or parallel |
| Water chamber | SS304 / SS316L, Ø38–76 mm, chamber length 150–500 mm, wall ≥ 0.8 mm |
| Pressure | Rated working 1.0–1.2 MPa · proof tested 1.5 MPa · 100 % of bodies pressure-checked |
| Element inside | Tubular SS321 / Incoloy 840, MgO compacted to 3.3–3.45 g/cm³ |
| Surface loading | Water 6–12 W/cm², sized to inlet temperature and flow rate |
| Flow / dry-burn | Thermal cut-out pocket 105 / 125 °C, or flow-switch interface wiring |
| Terminals | 4.8 / 6.3 mm flat pins, brass stud M4, high-temp 250 °C leads |
| Inlet / outlet | Brass or SS 1/2"–3/4" fittings, G / NPT / M thread, O-ring seat machined |
| Insulation resistance | ≥ 100 MΩ at 500 V DC after humidity cycle |
| Leakage current | < 0.75 mA at 1.06 × rated voltage, measured with chamber filled (wet) |
| Standards | IEC 60335-1 · IEC 60335-2-35 (instantaneous water heaters) · CE / RoHS; CQC markings per project |
Chamber and cast-body constructions from the same line — all pressure-tested and wet leakage-tested.
Four things we control in the process, and four reasons elements fail in the field.
NiCr coil, resistance matched ±3 %
MgO compacted to 3.3–3.45 g/cm³
Tube formed and welded into SS chamber
100 % 1.5 MPa proof, leak tested
Hipot, IR, wet leakage, R-value
200 pcs repeat size · 500 pcs new tooling · samples from 1 pc
After drawing confirmation, including test data
Engineering-backed quote with the wall thickness and watt density stated
200 pieces for a repeat chamber size, 500 for new tooling. Engineering samples of 5–20 pieces are available for type testing.
12–15 working days after drawing confirmation. Each body ships with hipot, insulation resistance, resistance value, wet leakage current and the 1.5 MPa pressure-test record.
Yes. Send the physical sample or a drawing with chamber Ø and length, fitting threads, wattage and terminal type. We measure it, return a dimension report, and match the electrical values.
IEC 60335-1 and IEC 60335-2-35 for instantaneous water heaters. Pressure per the rated working pressure of your appliance, proof tested at 1.5×.
Yes — laser or mechanical engraving of voltage, wattage, pressure class, batch number and your logo is done in-line, at no extra cost for repeat orders.
Send a drawing, a sample photo or just the application — we will tell you what watt density and sheath you need before quoting.