Few product categories combine electricity and water as intimately as domestic water heaters — and few carry a comparable risk when built badly. The geyser mounted above a bathroom, the immersion rod dropped into a bucket, and the instantaneous heater under a kitchen sink all place a live heating element inside a water-filled vessel in a wet room where users stand barefoot. Insulation failure, an earthing fault, a defective thermostat, or a jammed pressure-relief arrangement can produce electrocution or a burst tank.

That is precisely why the government has brought the category under compulsory BIS certification through the Electrical Appliances for Domestic Water Heating (Quality Control) Order — first notified as the 2023 Order vide S.O. 1253(E) dated 5 March 2024 and subsequently issued as the 2025 Order vide S.O. 355(E) dated 21 January 2025 — making the ISI mark mandatory under Scheme-I of the BIS (Conformity Assessment) Regulations, 2018, as listed on the BIS list of products under compulsory certification.

The order covers five Indian Standards spanning storage geysers, instantaneous heaters, immersion heaters, and gas-fired mini water heaters running on piped natural gas. For manufacturers and importers, every covered product must be made at a BIS-licensed factory and carry the ISI mark before it can be manufactured, imported, stored, or sold in India. This guide explains all five standards, what they test, the step-by-step ISI licensing process, documents, timelines, costs, common mistakes, and how water-heater certification fits into the wider India compliance picture — including the BEE star labelling that runs alongside it.

Why Domestic Water Heating Appliances Fall Under Mandatory BIS Certification

Quality Control Orders are the government’s instrument for making an Indian Standard mandatory. Once a QCO is notified under the BIS Act, 2016, no person can manufacture, import, distribute, sell, hire, lease, store, or exhibit for sale any covered product without the ISI mark granted under a valid BIS licence. For water heaters the safety case is unusually direct, because the hazards are severe and the failure modes are well documented.

Electric shock is the primary risk: a heating element whose sheath fails, an inadequate earth connection, or degraded insulation puts mains voltage into water that a user is touching. Storage geysers add a pressure hazard — a tank that continues heating because a thermostat has failed, with a blocked or absent pressure-relief valve, can rupture violently. Scalding is a third risk where temperature control is unreliable. Immersion heaters, the cheapest and most widely sold product in the category, are the most dangerous of all when badly made, because they are handled directly, immersed by hand, and frequently used in metal buckets.

None of this is assessable by the buyer. A geyser’s tank lining, element quality, thermostat reliability, and earthing integrity are invisible behind a painted shell. Certified conformity to the Indian Standard verifies electrical safety, thermal control, pressure integrity, and construction quality at the factory. For manufacturers, the QCO is also a commercial gate: organised retail, builders and project procurement, and e-commerce platforms verify BIS licences, and customs authorities check compliance at import.

Which Products Are Covered: All Five Notified Standards

The schedule to the QCO covers five Indian Standards:

Indian Standard	Product Category	Scope / Products Covered
IS 302 (Part 2/Sec 21):2018	Storage water heaters — electrical safety	Safety requirements for stationary storage type electric water heaters (geysers), part of the IS 302 household appliance safety family
IS 2082:2018	Storage water heaters — product specification	Construction and performance specification for stationary storage type electric water heaters (geysers); works alongside IS 302 Part 2/Sec 21
IS 302 (Part 2/Sec 35):2017	Instantaneous water heaters	Electric instantaneous water heaters, including under-sink and small on-demand units
IS 368:2014	Immersion water heaters	Electric immersion water heaters (immersion rods) used directly in buckets and containers
IS 17150:2019	PNG mini water heaters	Mini domestic water heaters using piped natural gas (PNG), including gas-specific safety requirements

Two structural points matter. First, storage geysers are addressed by two standards operating together: IS 302 (Part 2/Sec 21) is the safety standard within the IS 302 household-appliance safety family, while IS 2082 is the product specification covering construction and performance. A storage water heater manufacturer therefore needs conformity under both, not one or the other — a common and costly misreading at application stage.

Second, the schedule is not purely electrical: IS 17150 brings PNG-fired mini water heaters into the same order, so a manufacturer with both electric and gas lines needs to plan across the full schedule. Manufacturers should confirm the exact covered products, standards, and current editions against the latest notification before testing, because the licence is granted per standard, per manufacturing location.

Who Must Comply

The QCO binds every link in the supply chain. Indian manufacturers need a BIS licence under Scheme-I for each manufacturing premises and each applicable standard. Importers cannot clear covered water heaters through customs unless the foreign manufacturing site itself holds a BIS licence — obtained through the Foreign Manufacturers Certification Scheme (FMCS), under which BIS audits the overseas factory and grants the ISI licence to the foreign entity, which must also appoint an Authorised Indian Representative (AIR) resident in India. The Indian importer cannot hold the licence on the factory’s behalf.

Traders, distributors, builders, and marketplaces are equally barred from storing or selling non-compliant stock. Manufacturers should confirm the operative implementation dates for their enterprise category — general, small, and micro enterprises are given staggered timelines — against the current notification, particularly given that the category has been addressed by successive orders in 2024 and 2025. DPIIT has also issued cross-cutting exemption orders for goods and articles against import and against purchase (S.O. 775(E) and S.O. 776(E), both dated 13 February 2026) that apply across several QCO categories, and goods manufactured domestically for export are typically outside scope.

What the Standards Actually Test

Understanding what the laboratory examines clarifies why certification takes preparation. The standards evaluate water heating appliances across several critical areas.

• Protection against electric shock — the defining test for this category. Insulation resistance and dielectric strength are verified, including after humidity conditioning, because these appliances live in wet rooms. Earthing continuity is checked rigorously: the earth path from the element and metal parts to the supply earth must be low-resistance and secure. Creepage and clearance distances between live parts and accessible surfaces are measured. Leakage current is assessed under normal and fault conditions.
• Thermal control and abnormal operation — thermostat accuracy and the operation of the thermal cut-out are verified, and the appliance is run under abnormal conditions such as thermostat failure or dry operation to confirm that a secondary protective device intervenes before hazardous temperatures are reached. Dry-switch-on behaviour matters especially for immersion heaters and instantaneous units.
• Pressure integrity — for storage geysers, the tank is pressure tested and the pressure-relief arrangement verified. Tank material, lining or coating quality, and corrosion resistance are assessed under IS 2082, since tank failure over years of service is the dominant durability problem in this product.
• Thermal performance and standing loss — storage heaters are assessed for heat-up performance and standing heat loss, the measure of how much energy is wasted keeping stored water hot. This connects directly to the BEE star rating for the product.
• Construction, materials, and marking — element construction, wiring, connections, enclosure integrity and ingress protection, and mechanical strength are examined, along with prescribed marking including the ISI mark with the licence (CM/L) number, the IS number, and electrical ratings. For PNG units under IS 17150, gas-specific requirements including combustion safety, flame supervision, and gas-tightness apply.

Products must pass at a BIS-recognised laboratory, and the factory must demonstrate ongoing capability to manufacture conforming appliances — Scheme-I is a licence to a manufacturing process, not a one-time product approval. The Scheme of Inspection and Testing (SIT) requires specified in-house test equipment and quality records operating at the factory, including electrical safety testing and, for storage heaters, pressure testing capability.

Step-by-Step: Obtaining the BIS ISI Licence

The ISI licensing route under Scheme-I includes factory assessment. Our team manages each stage end to end, but every applicant should understand the sequence.

1. Product-standard mapping. Confirm which of the five standards apply to each product line — remembering that storage geysers need both IS 302 (Part 2/Sec 21) and IS 2082 — and structure the application per standard and location.
2. Gap assessment and in-house testing setup. Establish the electrical safety, thermal, and pressure test equipment and quality records the SIT requires before applying.
3. Application filing. Submit on the BIS portal with factory details, product and capacity details, manufacturing process flow, and prescribed fees — for foreign manufacturers, via FMCS with AIR nomination.
4. Factory inspection. A BIS officer visits the premises to verify the production process — tank fabrication and lining, element assembly, wiring, testing — in-house testing capability, and quality control arrangements, and draws samples across capacities.
5. Independent laboratory testing. Samples are tested against the applicable standards at a BIS-recognised laboratory — shock protection, thermal, abnormal operation, pressure, and performance tests as prescribed.
6. Grant of licence. On satisfactory inspection and test results, BIS grants the licence (CM/L number), authorising use of the Standard Mark.
7. Marking and ongoing compliance. Apply the ISI mark with the CM/L number and IS number as prescribed, operate the SIT, maintain test records, undergo periodic surveillance inspections and market sample testing, and renew on time.

Documents Required

• Company registration and factory establishment documents
• Manufacturing process flow chart — tank fabrication, lining/enamelling, element assembly, insulation, wiring, testing
• List of manufacturing machinery and in-house testing equipment
• Details of raw materials and bought-out components — tank steel, elements, thermostats, thermal cut-outs, relief valves, insulation — and their sources
• Product drawings, specifications, capacity range, and the model/variety list
• Circuit diagrams and wiring details
• In-house test records per the Scheme of Inspection and Testing
• Third-party laboratory test reports against the applicable IS (where drawn in advance)
• Calibration certificates for testing equipment
• Layout plan of the factory premises
• For foreign manufacturers: FMCS application, AIR nomination and undertakings, and factory audit logistics
• Authorised signatory details and application declarations

Timeline and Cost Planning

A realistic schedule for a domestic manufacturer is three to five months from a well-prepared application to grant of licence, with inspection scheduling and laboratory testing as the pacing items — water heater testing includes thermal and abnormal-operation sequences that take laboratory time by design. Foreign manufacturers under FMCS should plan for five to seven months, driven by overseas audit scheduling.

Costs fall into four buckets: BIS application and licence fees, the marking fee (linked to production), laboratory testing charges per standard and capacity group, and — for FMCS applicants — inspection travel costs and the AIR arrangement. A manufacturer covering storage, instantaneous, and immersion products needs licences across multiple standards, and storage geysers alone require two. Sensible grouping of capacities and models keeps testing proportionate. Budget separately for BEE star labelling, which storage water heaters carry alongside the ISI licence. Estimate your obligation with our India Compliance Cost Calculator.

Common Mistakes That Delay a Licence

• Certifying a geyser under only one standard. Storage water heaters need both IS 302 (Part 2/Sec 21) safety conformity and IS 2082 product conformity.
• Weak earthing design. Earthing continuity is tested rigorously in a wet-location appliance; a marginal earth path fails outright.
• Single-level thermal protection. Relying on the thermostat alone without an independent thermal cut-out fails abnormal-operation testing.
• Missing pressure test capability. Scheme-I requires in-house testing per the SIT; storage heater makers without pressure testing stall at inspection.
• Component substitution after grant. Changing element, thermostat, or relief-valve suppliers without managing the change undermines conformity at surveillance.
• Importer-as-licensee confusion. The licence must be held by the foreign factory under FMCS. Consignments from unlicensed factories are stopped at customs.
• Overlooking BEE. Storage water heaters carry star labelling obligations that run parallel to, not instead of, the ISI licence.

Water Heaters Within the Wider Compliance Picture

The ISI licence is the centrepiece, but a water heater business carries adjacent obligations. Storage water heaters fall under the BEE star labelling programme — see our BEE Registration service — and the standing-loss performance verified during ISI testing feeds directly into the star rating, so the two programmes should be planned together. Producers and importers of electrical and electronic equipment must hold EPR registration for e-waste with CPCB. Packaged retail products are pre-packaged commodities requiring Legal Metrology (LMPC) registration. Manufacturers and importers using plastic packaging need EPR registration for plastic waste. Importers require valid import documentation and IEC — see our DGFT license services. A coordinated plan brings the BIS ISI licence, BEE, EPR, and LMPC together.

Pre-Launch Compliance Checklist

Before committing to production or a shipment, run this verification sequence. First, map every product to the correct standards among the five — confirming the dual requirement for storage geysers — and check current editions. Second, verify the manufacturing site holds or has applied for the Scheme-I licence, with an AIR in place for foreign factories. Third, confirm in-house electrical, thermal, and pressure testing and SIT records are operational. Fourth, check the ISI mark, CM/L number, IS number, and electrical ratings appear correctly on the appliance and packaging. Fifth, align model, capacity, and factory address across product, test reports, and licence scope. Sixth, close the adjacent items: BEE star labelling for storage heaters, e-waste EPR, LMPC declarations, and import documentation.

For ongoing operations, maintain a compliance register per model: CM/L number and validity, standards and editions, licensed capacities, component sources, surveillance inspection dates, market sample results, and renewal timelines.

Frequently Asked Questions

Is BIS certification mandatory for water heaters and geysers in India?

Yes. Under the Electrical Appliances for Domestic Water Heating (Quality Control) Order — notified as the 2023 Order vide S.O. 1253(E) dated 5 March 2024 and as the 2025 Order vide S.O. 355(E) dated 21 January 2025 — covered appliances cannot be manufactured, imported, or sold in India without the ISI mark under a valid BIS licence.

Which Indian Standards are covered?

Five: IS 302 (Part 2/Sec 21):2018 for stationary storage type electric water heaters, IS 302 (Part 2/Sec 35):2017 for electric instantaneous water heaters, IS 368:2014 for electric immersion water heaters, IS 2082:2018 for stationary storage type electric water heaters, and IS 17150:2019 for mini domestic water heaters using piped natural gas.

Why do storage geysers need two standards?

IS 302 (Part 2/Sec 21) is the electrical safety standard within the IS 302 household-appliance family, while IS 2082 is the product specification covering construction and performance. A storage water heater manufacturer needs conformity under both.

Are immersion rods covered?

Yes. Electric immersion water heaters fall under IS 368:2014. As the cheapest and most directly handled product in the category, they are among the most safety-critical.

Are gas water heaters covered?

Mini domestic water heaters for use with piped natural gas are covered under IS 17150:2019. These engage gas-specific safety requirements including combustion safety and gas-tightness alongside general construction requirements.

Can importers get the BIS licence themselves?

No. Under FMCS the licence is granted to the foreign manufacturing site, which must appoint an Authorised Indian Representative resident in India. Importers can only source covered appliances from factories holding a valid BIS licence.

Does the ISI licence replace BEE star labelling?

No. They are separate programmes running in parallel. Storage water heaters need the ISI licence for safety and construction conformity and BEE star labelling for energy performance.

What are the penalties for non-compliance?

Manufacturing or selling covered water heating appliances without the ISI mark is an offence under the BIS Act, 2016, attracting imprisonment of up to two years and/or fines starting at ₹2 lakh, alongside seizure of non-compliant stock and customs detention of imports.

Why Choose PCN India Global

• Water heating QCO expertise — precise mapping across all five standards, including the dual IS 302/IS 2082 requirement for storage geysers
• Factory readiness — we prepare your electrical, thermal, and pressure testing setup and SIT records so the BIS inspection passes the first time
• FMCS for foreign manufacturers — end-to-end management of the overseas audit, and we act as your Authorised Indian Representative
• BEE alongside BIS — we plan star labelling and the ISI licence together so performance testing serves both
• Lab coordination — testing at BIS-recognised laboratories with efficient capacity grouping to minimise cost
• Surveillance and renewal tracking — so your CM/L stays valid and component changes are managed proactively

PCN India Global manages the complete BIS ISI certification process for water heater manufacturers and importers — from standard mapping and factory preparation to licence grant and renewal, coordinated with the BEE, EPR, and LMPC obligations this category carries. Contact us: WhatsApp +91 80109 05029, email bdm@pcnindiaglobal.com, or start your application today.

Related Compliance Guides

• BIS Certification (ISI Mark) — Complete Service Overview
• BEE Registration and Star Labelling
• EPR Registration for E-Waste