Hi there I'm Ellis M.D. of gosolarinspain.com We sell solar water heaters to customers all over mainland Spain. We sell the vacuum tube compact models the same as you do but we only sell the new vented to atmosphere models. The ones with the small assistant tank on top. We are (probably) the number one supplier of solar electric home kits to expats in Spain. Before adding solar hot water heaters to our Spain range we did a great deal of research. We heard so many horror stories from people in Spain who had bought systems which had steam valves instead of vent to atmosphere systems. When buying a solar water heater in Spain because hard water is a problem we strongly recommend you avoid systems which use steam valves to relieve pressure. These systems work OK until the steam valve fails then they often explode. Alternatively they may boil dry and implode when they cool down





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