Draining Central Heating with Underfloor heating

1 Jun 2021
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United Kingdom
My CH system is a Rayburn Heatranger with underfloor heating downstairs and conventional radiators upstairs.
I need to drain the upstairs system.
My questions is.
Are the 2 systems separate or connected ?, ie if I drain the upstairs system with the pressure drop in the underfloor heating system.

Rgds Chris
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If you’re only draining upstairs the underfloor should remain unaffected, the same way as if it were radiators. Water will stay in the ufh circuit because that’s the lowest point.

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