Most manifolds come with them pre fitted now, we did ours over 10 years ago and things have moved on. Think about where the manifold will be - with such a large area, you’ll have more than one circuit so remember the pipes will all come from the manifold and that area will get warm. Plus you’ll need the electrical control box next to it and be able to get into it now and again. Also, they should fit a drain through an outside wall so you can easily drain the UFH loops if needed.
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