The Vaillant Eco-Tec Pro 24 Vaillant Eco-Tec Pro 24 is a combination boiler that requires no water storage tanks, it works on the incoming mains supply. So long as you have decent water pressure and flow rate, then the Vaillant Eco-Tec Pro 24 is ideal if you want to convert to a combination boiler. Vaillant produces 2 models of combination boilers, one is called the [...]
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