Winterize Hayward H150FD (or same series) pool heater

[Chamnic]

Hello

Anybody has one of those pool to winterize (H150FD, H200FD, 250,300,350,400,500 ...

Manual only says to remove one plastic drain plug (located in middle of heat exchanger header) which I did but not much water came out.
Kind of worried there is still some waterleft ?

Is that the only thing to do ?

Thanks in advance.

 

[cowboycasey]

I would tend to believe the manufacture... Are you seeing any other drain plugs?

 

[Chamnic]

Nope, no other plug. Like you say, can't be wrong with following manual. I'm probably worried for nothing, it's in my nature