Supreme Solar offers ETC tubes specifically graded by water hardness (Copper up to 1200 PPM, SS 316L up to 1000 PPM, SS 304L up to 400 PPM) — the only brand in this set with explicit PPM-matched options. It is also MNRE-approved for subsidy. V-Guard wins on Kerala service and the unique Eco Aux electric-backup model.
Headline differences between V-Guard and Supreme Solar for the solar water heater category.
| Dimension | V-Guard Ensol stocks | Supreme Solar |
|---|---|---|
| Tech offered | ETC + FPC + Aux backup | ETC (Copper / SS 316L / SS 304L) + FPC + glass-lined |
| Hard-water grading | Single ETC grade | Three grades by PPM tolerance |
| MNRE approved | Verify per SKU | Yes — eligible for subsidy schemes |
| Top warranty | Tru-Hot Pro ZA: 10 years | 5 years on tank |
| Service in Kerala | Best-in-Kerala | Moderate (verify locally) |
Supreme Solar publishes explicit hardness-tolerance ratings: Copper tubes for up to 1200 PPM, SS 316L for up to 1000 PPM, SS 304L for up to 400 PPM. If your borewell water is on the harder side, this lets you (or your installer) match the tube grade to your actual PPM.
For most Kollam municipal-water homes, hardness is moderate. V-Guard Win-Hot Eco Aux gives you electric backup for monsoon days, and V-Guard's Kerala service network is the densest of any solar water heater brand.
Ensol is the authorised distributor for this brand in Kollam district, Kerala — same-day home delivery and on-site installation support.
Kerala homes with adequate roof space and moderate water hardness — backup-AUX option for monsoon reliability.
Honest limits: ETC vacuum tubes need a softener in hard-water areas; FPC pressure ratings lower than premium imports.
Kerala buyers (or installers) who actively match ETC tube grade to local water PPM and want subsidy eligibility.
Honest limits: Lower brand recognition vs V-Guard / Racold; Service network outside Karnataka and South-tier cities thinner — verify locally.
Yes — Supreme Solar lists MNRE approval and ISO 9001:2000 certification, making it eligible for relevant solar water heater subsidy schemes.
For very hard water, Supreme Solar Copper-grade ETC or Racold Alpha Pro. For moderate water, V-Guard Win-Hot Plus or Eco Aux is sufficient.
Ensol is the authorised distributor in Kollam district. Same-day home delivery, expert sizing, on-site installation support.