VAILLANT Extension Pack 4 1 mixing circuit, 1 unregulated heating circuit Package consists of: VAILLANT manifold WHV 35 for 2 pump groups with integrated hydraulic separator 3.5 m3/h, complete completely prepared for connection of 2 pump groups (with or without 3-way mixer), with thermal insulation and sensor Order no. 0020042429 1 x 0020042429 Manifold WHV 35 1 x 0020191788 Pump group with 3- way mixer Rp1 1 x 0020191817 Pump group without mixer Order no. 0020219141
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