01ETC or FPC?
ETC uses evacuated glass tubes and is economical for many domestic installations. FPC uses a glazed metal absorber and serviceable hydraulic passages, making it a strong choice for engineered, pressurised or large commercial fields. Water chemistry, pressure, roof access, winter demand and service capability decide the better technology.
- ETC: compact, lower entry cost, tube-by-tube replacement
- FPC: robust collector, engineered arrays, indirect-loop option
- Both need insulated storage, safe valves and correct piping
02Capacity logic
Domestic planning often begins near 25–35 litres of stored hot water per person per day, but showers, kitchens, laundries and hospitals need fixture-by-fixture peak calculations. Select the next standard LPD after temperature-mixing, distribution and standby allowances. Oversizing wastes capital; undersizing forces backup energy.
- 100–300 LPD: many homes
- 500–1,000 LPD: guest houses, hostels and small institutions
- 2,000–10,000 LPD: hourly load profile and EPC design required
03Patna installation checklist
A survey confirms shade-free roof area, structure, south-facing orientation, safe access, tank loading, water pressure, pipe route, drain, lightning exposure and electrical backup. Hardness and chloride testing guide tank metallurgy and whether scaling controls or an indirect heat exchanger are sensible.
- Commission cold and hot loops before handover
- Insulate every hot-water and recirculation line
- Record temperatures, pressure and flow as baseline
04Why SSmartSolar
SSmartSolar is the solar trade identity of SS Enterprises. The workflow covers survey, load assessment, approved make/model comparison, supply, erection, testing, commissioning, user training, preventive maintenance and documented service. Commercial proposals state inclusions, exclusions, warranty boundary and optional AMC.
Planning table
Compare before requesting a quote
| Typical capacity | ETC planning range | FPC planning range | Typical use |
|---|
| 100 LPD | ₹28,000–₹38,000 | ₹55,000–₹75,000 | 2–3 users |
| 200 LPD | ₹40,000–₹58,000 | ₹70,000–₹1,05,000 | 4–7 users |
| 300 LPD | ₹55,000–₹80,000 | ₹1,00,000–₹1,45,000 | Large home / small hostel |
| 500 LPD | ₹85,000–₹1,40,000 | ₹1,65,000–₹2,40,000 | Commercial / institution |
Indicative ranges are planning aids for Patna, not quotations. Capacity, pressure, tank metallurgy, roof work, piping, controls, GST, transport, electrical work and warranty can change the signed price.
