WSE 47 evacuated tube solar water heaters Most efficient technology on the market to date Excellent for swimming pools Make heat even on overcast days $400.00 per 20 tube panel FOB Saskatoon or $450.00 our location + applicable taxes. Hard borosilicate glass tubes will handle hail up to 30 mm Unlike flat or rubber panels, these will not loose your heat at night or in overcast or cold weather. For more information contact us at 519 205 0650