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I've managed most of ours without using caps. Just had old towels and a tray on standby.
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You should be fine. The problem is if it gets cold enough for the TRV to open to protect against frozen pipes which is unlikely in 10 minutes during the day.
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10 mins, you'll be longer than that for sure unless its the same identical rad which they never are. If you have a pressured system just drain it. Takes no time and saves you flooding the place if you make a mistake.
atk
jellybaby
konastab01
@Polygon
I need to fit a radiator today. Will I get away with just turning the TRV right down for the ten minutes it should take? My local Screwfix are out of those little TRV caps at the moment.