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Default Where does air come from in a sealed heating system?

On Saturday, February 25, 2017 at 3:01:42 PM UTC, wrote:
On Sat, 25 Feb 2017 08:28:08 +0000, The Natural Philosopher
wrote:




well anyone who has a gas stove knows the danger that it will strike
back through the gas mains into he gasometer down the road and blow the
town up every time you want to boil a kettle.

Even my old gran knew that in 1955.


Was she like mine mine and thought electricity leaked from lamp
sockets if there was no bulb in them ?


G.Harman


My Mum thought the electric leaked out of 3-pin sockets that were left switched on with nothing plugged in. I pointed out the little plastic shutters on the L & N pins that stopped the electric leaking out.

She grew up a long way from mains electricity.