I have decided to go with an Eheim 2215 canister filter for my new 40 gallon breeder tank, and I'd like to use an inline heater with this filter...

What are your experiences with inline heaters?...I suppose they just hook up "in line" with the output hose from the filter?...do they work well?

Do all inline heaters fit all canister filter hoses?...how do I know which heater to get for the Eheim 2215?

All input appreciated greatly, as always