We have a Chromalox EDB-20-1 hot water furnace, and it sounds like a flowing stream whenever the water flows through the house
The bang is probably water hammer - there are various ways to deal with that.

The whooshing sound, may be caused by bubbles of air in the water-pipes. The normal way to deal with that is to bleed air out of the system when it is not running. The system will have bleed valves. Their location and type depend on the type of system and vary by locale/country. You can obtain automatic air vent/bleed devices that can be plumbed in to automatically bleed air out of a system (the drawback might be that you are not alerted to a problem with air getting into your system)