F.A.Q » What do I have to use inside the panel/s?

Inside the closed circuit of the panel you are advised to use a mixture of biodegradable glycol and distilled water. There are a number of products available on the market, either in pure form or premixed. Inside the boiler goes the sanitary water you receive from the water supply line for domestic use. Do not use the solar water heater for any other liquid that is not sanitary water for domestic use.