So you are looking for a Salamander pump to boost your water, but confused by the terminology. Here is a brief guide to help.
Positive or Negative Head?
Which model would suit my application?
If you require both hot and cold to be pumped simultaneously you will require a twin pump. If you only require the hot or cold to be pump you will require a single outlet pump.
Below is a simple layout to explain what is a positive head and negative head:-
If you are unsure you could go with a universal pump which covers both the positive head and negative head options.
Below is a simple chart which explains which Salamander model is suitable for each application.
So hopefully you know have more understanding of what you require, click here to see the pumps we have to offer