On 05/09/2018 10:44 AM, Jimmy Wilkinson Knife wrote:
On Wed, 09 May 2018 04:13:38 +0100, rbowman wrote:

On 05/08/2018 03:43 PM, Jimmy Wilkinson Knife wrote:
It's not so much the water getting out as air (well hydrogen) being
created from rust inside the radiators and blocking the flow of water.
Why can't someone invent a water pump that can cope with an air bubble?

Switch to steam heat; the radiators have air vents.

What do you mean they have air vents?


https://www.youtube.com/watch?v=y0VQOZqiw7U

One picture... It's steam, not hot water. The steam flows to the
radiator and the condensate returns to the boiler. When the boiler shuts
down the system fills with air. The air has to be bled to allow the
steam to reach the radiator, hence the air vent. In theory when the air
is all vented the valve shuts off; in practice the damn things can
whistle like a tea kettle.