Yes they were originally for hot water. They are domestic 100 Litre hot water cylinders that originally had a resistive heater inside. There is a quite thick layer of foam insulation between the steel tank and the outside jacket. As a bonus, being intended for domestic water, the insides are coated with enamel so less chance of corrosion problems.
With the two tanks in series and a recirculating pump they are just about perfect for use with the solar panels.
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