It is Solar that works at Night! We have an exciting, highly advanced, truly next generation thermodynamic solar system for heating your hot water. It works 24 hours a day, 365 days a year and provides you with ALL your hot water. Yes it even works at night! It can supply your home or business with all your hot water requirements and save you up to 85% of your water heating costs year after year. PIR insulation with unbeatable R-Values The boards are 2400 x 1200 and are available in the following thickness from stock. Check out the incredible R-Values below: 25mm R-1.14 50mm R-2.27 75mm R-3.41 90mm R-4.50 120mm R-5.45 Great Insulation, great performance. Check out our www.thealternativeenergycompany.co.nz Ring us on 03 540 3003