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Toddyplumb

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Installing a Velux solar kit soon for a customer . Anyone installed one ? Things to watch for ? I have noticed it has no air vent at top of the panels , inlet and outlet are at the bottom (great air trap !)
 
The solar primary circuit on this system has a 2 port valve . It has to be fitted as part of their WRAS approval. The valve is only rated at 88 degrees centigrade. Velux technical say this is fine, the WRAS certificate only says a valve is provided it does not give a temperature rating. Bearing in mind this valve is to operate under stagnation any got any comments ?
 
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