About RainbowHome Water
We help Indian homes capture rain, clear the mandate, and stop paying the tanker mafia.
RainbowHome launched in 2026 as a rooftop solar aggregator for Indian homeowners. We added rainwater harvesting as a second vertical because the same problems apply: a government-mandated retrofit, a fragmented installer market, opaque pricing, and no neutral place to compare.
Our independence
Three commitments — every page, every time
- 1We never install. No RainbowHome-branded crew shows up on your roof. We compare and recommend; vetted installers do the install.
- 2We never take commission on conversion. Installers pay us per qualified lead, not per closed sale. Our incentive is your match quality, not your purchase.
- 3We publish regulation data with source links. Every mandate, tariff, and subsidy card shows the source URL and the last-verified date. If a rule changes, you see it.
Why water, why now
Bangalore had a Day Zero scare in 2024. Chennai had a real one in 2019. Tamil Nadu has mandated rooftop RWH on every building since 2001 and Karnataka has mandated it on plots ≥ 1,200 sq ft since 2009 — yet most homeowners still don't know who to call, what the system actually costs, or whether their installer is on the BWSSB / CMWSSB recommended list.
That's the gap we fill: a free calculator that sizes your harvest honestly (BIS IS 15797:2008 formula, IMD rainfall data, your roof, your bill), a directory of installers ranked by price per m² and certification, and the loan-comparison surface for the homeowners who need to finance the install.
What we're honest about
- There is no equivalent central subsidy for water. The rooftop-solar story has a clean hero number — ₹78,000 in central subsidy. Water doesn't. The economic case rests on penalty avoidance, tanker reduction, and bill savings — we surface all three transparently.
- We are not a regulated water utility. Compliance verification is via BWSSB / CMWSSB, not us. We help you understand what compliance means and connect you to certified installers, but the final inspection and sign-off belongs to your water board.
- We are not a regulated lender.The home-improvement loans we surface are the lenders' own products. We earn a one-time referral fee when you choose one — never a spread on the rate. You pay the same as you would going direct.
- Verified partners only. We list installers and banks once we have verified their details. As more partnerships sign, the directory grows — we never pad it with invented rows.
Where we operate
Karnataka and Tamil Nadu, the two states with the most-enforced residential RWH mandates. Maharashtra, Delhi, and Andhra Pradesh are next. Drop us a line if you'd like us to prioritise your state.
Try it
See your roof's harvest, system size, mandate status, and payback in 60 seconds.
Calculate my harvest