Start with demand, not product type
Every market, project and end-user profile creates a different hot-water pattern. Define the use case first, then select the equipment. A distributor building a residential assortment needs a different decision process from an EPC team supplying hundreds of apartments.
Prioritise household size, installation space, ease of use and local electrical limits.
Calculate total demand, peak concurrency, mounting constraints and maintenance access.
Review recovery time, duty cycle, redundancy and service continuity.
Key specifications that matter
Product type is only one part of the specification. Buyers should confirm the complete operating context before requesting samples or quotations.
- Demand profileDaily volume, peak periods and simultaneous use.
- Electrical supplyVoltage, phase, frequency and available circuit capacity.
- Water conditionsInlet temperature, water pressure and hardness.
- Installation environmentIndoor or outdoor position, mounting area, drainage and access.
- Market requirementsSafety certification, energy rules, labels and local documentation.
Voltage, power & capacity guide
Use the table as a procurement discussion framework. Final selections should be checked against the project's calculated demand and local codes.
| Buyer situation | What to verify | Common risk |
|---|---|---|
| Residential distributor | Local voltage and phase, typical household capacity needs, installation space | Wrong voltage or tank size leads to returns and poor reviews |
| Apartment project | Total daily demand, peak usage pattern, mounting dimensions | Undersized capacity causes complaints and rework |
| Hospitality / commercial | High-demand profile, recovery time, inlet temperature and power availability | Insufficient recovery affects guest experience and operations |
Buyer checklist
- Daily hot-water demand
- Local voltage and phase
- Incoming water temperature
- Installation space
- Required certification
Installation and application fit
Confirm the physical installation before approving the product. Record wall strength, clearances, pipe route, drainage, ventilation where applicable, service access and the maximum available electrical load.
Ask for dimensioned drawings and installation instructions during supplier evaluation—not after the order is placed.
Compliance and certification
Certification requirements vary by destination and channel. Build a market checklist covering electrical safety, energy efficiency, labeling, plug or wiring practice, instruction language and importer documentation.
OEM and branding requirements
For private-label programs, define the scope early: logo placement, control-panel language, packaging, manuals, rating labels, accessories and quality-approval samples. Separating mandatory engineering changes from cosmetic branding keeps quotations comparable.
Supplier evaluation checklist
- 01
Ask for specification evidence. Compare drawings, electrical data, test records and certification scope.
- 02
Confirm sample approval. Document every market-specific detail before mass production.
- 03
Review quality checkpoints. Agree on inspection criteria, packaging tests and shipment documentation.
- 04
Plan after-sales support. Clarify spare parts, troubleshooting information and warranty handling.
Common mistakes to avoid
- Choosing based on price alone without checking real demand.
- Ignoring local voltage, phase or frequency requirements.
- Overlooking inlet-water temperature differences between regions.
- Underestimating installation space and mounting constraints.
- Skipping certification or local compliance requirements.
Frequently asked questions
What size water heater is right for a three-person household?
An 80–100 litre storage water heater is a common starting point, but the final size depends on shower duration, simultaneous demand, recovery rate and local inlet-water temperature. Project buyers should validate these inputs before fixing a capacity.
Can one model be sold in every country?
Usually not without verification. Voltage, phase, frequency, plug or wiring method, energy rules, safety certification, water pressure and installation practice can all vary by market.
When should buyers consider OEM customization?
OEM becomes useful when a distributor needs market-specific electrical configuration, control language, branding, packaging, documentation or a repeatable assortment for its sales channel.