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Marking on the supply and return lines is missing
The marking on the heater is normally missing; is there a red and blue marking for the supply or return flow at the connections, or can the supply or return flow be connected anywhere? Please let me know
Kind regards.G.Lutz
lutznauders
Posted Sep 14, 2026 at 7:26 AM · Edited Sep 14, 2026 at 7:26 AM·Last reply Sep 14, 2026 at 9:48 AM
2 comments
bootyooty
MentorSep 14, 2026 at 9:48 AMHi @lutznauders this is a public community and not your seller that you apparently wanted to ask.
Please use the "Contact seller" function on the item you purchased for that.
perfect-sally
MentorSep 14, 2026 at 7:31 AMWe are a community of users here and not heating installers!
Why don't you ask your seller?
I can only tell you that it doesn't matter where you connect what, it has to be connected correctly if the heating is supposed to work.