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Hi, I need to fit a single trv. Don't want to drain my system again so will use a bung. It's an open vented system with a combined feed and expansion tank. Will I just need to use 1 bung or am I missing something obvious. Thanks.

Hi, Just a quick question before I buy it. I have an Potterton suprima 40 boiler with a Drayton RTS1 room thermostat. I'd like to change it for the honeywell cm927. I've looked at the wiring and it seems to be ok. At present I have live, neutral and call wires in the rts1. There is...