Romstal SM ECO 25, Инструкция по использованию, техническому обслуживанию и монтажу

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Figure 22.
11. PRESSURE AND RETURN PIPE
Outputs of the pressure and return pipes on the boiler are 1'' and you cannot reduce them or taper to the
first bifurcation. Use a 1’’ steel pipe or a copper pipe with the outside diameter of Ø28mm or greater.
When installing, strictly observe the slopes of pipes as they need to be at 0.5% (5mm. per meter of pipe)
and the venting system (boiler, pipes, radiators).
Set up a thermo hydrometer at the pressure line to show the water pressure in the system and the water
temperature at the back end of the boiler.