This Vaillant substitute diverter valve is well suited with ecoTEC VUW (condensing), ecoTEC VUI (condensing) and Guernsey/Jersey only (condensing) boilers. A directional water tool in combi boilers, a diverter valve directs warm water right into a heating gadget or a warm water gadget. This characteristic method that combis are capable of offer each heating and warm water with out the want for a garage cylinder. Show More Show Less
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