Caleffi 668 / 671 underfloor heating manifold

What is in the box

• 671 composite: technopolymer supply and return manifolds, end pieces with automatic air vent with hygroscopic cap, drain valve and fill/drain cock, a pair of ball shut-off valves, LCD thermometers on supply and return, room labels, mounting brackets, the 675850 clip fitting adaptor and the 675002 pipe cutting template.
• 668 brass: supply manifold with flow meters and actuator-ready return manifold, end piece with multi-position ball valve, automatic air vent and fill/drain hose connection, offset bypass kit with fixed setting and connecting pipe, ball shut-off valves and mounting brackets.

How to choose

• Choose the number of outlets by the number of underfloor loops; each loop uses one supply and one return outlet.
• For low-pressure residential systems 671 (max. 6 bar, 5–60 °C) is enough; for higher pressure or temperature choose brass 668 (max. 10 bar, 0–80 °C).
• For manifolds with a high total flow or many outlets, prefer the 6687 version of 668 with 1 1/4" connections.
• Choose the manifold cabinet by the width in the table; for 668 with AUTOFLOW flow regulators the second value applies.

How to write it in a quote

State series, connection and number of outlets: "Caleffi 6686H5S1 underfloor heating manifold, brass, 1", 8 outlets, with flow meters". Thermal actuators, the manifold cabinet and pipe fittings are not included; list them as separate lines.