integrated copper coil solar hot water heater Certificate: SRCC, Solar Keymark, CE and ISO9001 1. Use in any time: it ... .6. Fashionable: the appearance is fashionable and it can great integrate with you fitment.7. No corrosion or scaling:as almost ... corrosionscale buildup is almost totally eliminated. Certificate: ISO,CE,SGS, Solar Keymark and SRCC