What happens if water freezes on the outside of a closed loop ...

[penguins]

What happens if water freezes on the outside of a closed loop pond heat pump system?
 
  What will be an ideal response?

Question 2

List the types of heat pumps available by combinations of heat source and heat sink.
 
  What will be an ideal response?

[Jevvish]

Answer to Question 1

If ice starts to build on the outside of the pipe in the loop, the ice on the outside surface of the closed loop piping acts as insulation, reducing the efficiency of the system dramatically.

Answer to Question 2

Air to air, water to air, air to water, water to water

[penguins]

Thanks for the timely response, appreciate it

[amandalm]

Gracias!