Vaillant Eco Tec System Boilers Vaillant Eco-Tec System boilers come in many sizes, They range from 12 kW up to 37 kW. With a system boiler, you don’t need the feed and expansion tank normally located in the loft area. These boilers have an expansion vessel built in so no tank is required. pump and bypass valve are also built into the boiler. The Vaillant Eco-Tec System boilers [...]
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