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BIS Certification for Electric Instantaneous Water Heaters

  • 30-Jan-2026
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BIS Certification for Electric Instantaneous Water Heaters – IS 302 (Part 2/Sec 35):2017 Compliance Guide

BIS Certification for Electric Instantaneous Water Heaters | IS 302-2-35:2017

Introduction

Electric instantaneous water heaters, commonly known as instant water heaters, provide hot water on demand without the need for storage tanks. Due to their high power consumption and direct water–electricity interaction, strict safety and quality standards are essential. To regulate these appliances, the Bureau of Indian Standards (BIS) mandates certification under IS 302 (Part 2/Section 35):2017.

This blog explains the complete compliance framework for BIS Certification for Electric Instantaneous Water Heaters, including safety requirements, testing, and the approval process in India.

What Is BIS Certification for Electric Instantaneous Water Heaters?

BIS Certification is a conformity assessment issued by the Bureau of Indian Standards, ensuring that electrical appliances meet prescribed Indian safety standards.

For electric instantaneous water heaters, compliance with IS 302-2-35:2017 is mandatory. Upon certification, manufacturers are authorized to use the ISI Mark, confirming product safety, reliability, and regulatory compliance.

Applicable Indian Standard – IS 302-2-35:2017

IS 302 (Part 2 Section 35):2017 is part of the IS 302 series, which defines safety requirements for household and similar electrical appliances.

This section specifically applies to:

  • Electric instantaneous (tankless) water heaters
  • Compact water heating units for domestic use
  • Appliances designed for continuous water flow heating

The standard focuses on electrical safety, thermal protection, pressure control, and moisture resistance.

Scope of IS 302 (Part 2/Sec 35):2017

The standard applies to:

  • Electric instantaneous water heaters for household use
  • Wall-mounted or under-sink instant heaters
  • Appliances operating at rated voltages up to 250V

It ensures safe operation under normal and abnormal conditions.

Key Safety & Performance Requirements Under IS 302-2-35:2017

1. Protection Against Electric Shock

  • Adequate insulation of live components

  • Proper earthing and grounding

  • Safe enclosure design to prevent user contact

2. Temperature Control & Overheating Protection

  • Automatic temperature control systems

  • Thermal cut-out to prevent overheating

  • Safe operation during flow interruption

3. Pressure & Water Flow Safety

  • Resistance to internal water pressure

  • Protection against pressure surges

  • Safe design of water inlet and outlet connections

4. Moisture Resistance

  • Protection against water ingress

  • Reliable performance in humid environments

5. Mechanical Strength & Durability

  • Resistance to mechanical stress and impact

  • Secure mounting and enclosure integrity

Testing Requirements for BIS Certification

Electric instantaneous water heaters must be tested at a BIS-recognized laboratory as per IS 302-2-35:2017. Key tests include:

  • Dielectric strength (high voltage) test
  • Insulation resistance test
  • Temperature rise test
  • Leakage current test
  • Pressure resistance test
  • Abnormal operation test

Only products that pass all required tests are eligible for BIS certification.

BIS Certification Process for Instantaneous Water Heaters

Step 1: Application Submission

Submit the BIS application with manufacturer and product details.

Step 2: Product Testing

Send product samples to a BIS-approved laboratory for testing under IS 302-2-35:2017.

Step 3: Factory Inspection

BIS conducts a factory audit to verify quality control systems and production capability.

Step 4: Grant of BIS License

Upon successful evaluation, BIS issues the ISI Certification License.

Step 5: ISI Marking

Manufacturers can affix the ISI mark on certified electric instantaneous water heaters.

Documents Required for BIS Certification

  • Manufacturing unit registration documents
  • Product technical specifications and drawings
  • Electrical circuit diagrams
  • Test reports from BIS-recognized laboratory
  • Quality control plan
  • Factory layout and machinery list

Who Needs BIS Certification?

  • Manufacturers of electric instantaneous water heaters in India
  • Importers of instant water heaters into India
  • Brand owners selling instant heaters under private labels

Benefits of BIS Certification for Instant Water Heaters

  • Mandatory legal compliance in India
  • Enhanced consumer safety and confidence
  • Improved product reliability and market acceptance
  • Eligibility for retail chains and institutional supply
  • Reduced risk of product recalls and safety incidents

Penalties for Non-Compliance

Selling or importing electric instantaneous water heaters without BIS certification may result in:

  • Financial penalties
  • Seizure of goods
  • Ban on sale or import
  • Legal action under the BIS Act

How Induce India Can Help

Induce India provides end-to-end support for BIS Certification for Electric Instantaneous Water Heaters under IS 302-2-35:2017, including:

  • Standard applicability assessment
  • Documentation and application filing
  • Sample testing coordination
  • Factory inspection preparation
  • Post-certification compliance support

Our experienced professionals ensure faster approvals with complete regulatory compliance.

Conclusion

BIS Certification under IS 302 (Part 2 Section 35):2017 is essential to ensure the safety, quality, and legal compliance of electric instantaneous water heaters in India. Compliance not only protects consumers from electrical and thermal hazards but also strengthens brand credibility and market trust.

If you manufacture or import electric instantaneous water heaters, obtaining BIS certification is a crucial step toward compliant and sustainable business growth.

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