Viessmann boiler failure

[ppppenguin]

The reason for cleaning the system is to avoid another similar hose failure and ultimately premature failure of the heat exchanger in the boiler. It can definitely wait until summer. The black muck isn't significantly impairing efficiency or effectiveness.

Fortunately I still have a conventional vented hot water system with cylinder. The immersion works OK. i have pumps on both showers to get decent flow and pressure.