Solar thermal: free hot water 9 months a year
Thermal collectors for domestic hot water and heating support. Excellent yield as a complement to a heat pump or wood stove.
Why choose this solution
70% of DHW needs
4-6 m² of collectors cover 70% of a 4-person household's annual hot water needs.
Modest investment
The cheapest install to begin a transition. Ideal as a complement to an existing system.
Very high yield
Thermal collectors convert 75-85% of solar energy to heat (vs 20% for PV).
Who is this for?
- Family homes with significant DHW consumption
- Buildings with central heating plant
- Hotels, restaurants, care homes, pools
- Complementing a HP or wood stove
Our process
/01
DHW needs study
Consumption calculation, collector and tank sizing.
/02
Collector install
Flat (4-8 m²) or evacuated tubes depending on orientation. 1-2 days on site.
/03
Solar tank
Storage tank install (300-500 L) in technical room, with solar coil and backup.
/04
Control
Differential controller commissioning, cycle optimization.
Indicative pricing
from CHF 12'000
From CHF 12,000 for a 4 m² + 400 L tank installation. Cantonal grant ~CHF 2,000.
FAQ — Solar thermal: free hot water 9 months a year
Tax advantage · 2026-2028 window
100% deductible from your taxable income
Following the September 28, 2025 federal vote, the tax deduction for energy renovations will be removed from January 1, 2029 at the federal level. Use the current window to save up to 30% of the real cost.
Example — 50,000 CHF project
Potential tax saving:
9 000CHF
30% marginal rate
Indicative estimate. Each situation must be validated by a tax advisor.
Ready to start your project?
Free quote, grant support, in-house team.