Raypak Heat Pump R5450ti-E vs M5450ti-E

[gdo]

Hi,
I'm getting a little confused with the Raypak heat pump SKUs.
I asked my pool guy to get an 5450, and he told me his supplier got one with part number 016012.
When I look at Raypak Heat Pump 5450 Model 103K BTU | Titanium Heat Exchanger | Digital Controls | M5450ti-E 016012 R5450ti-E 016010 it seems like 016012 is for the M5450ti-E and 016010 is for the R5450ti-E.
I'm not sure what the differences are between the R and the M version, what "ti" means, and what "E" means (E doesn't seem to show on the manual I downloaded from the Raypak website).
Can someone please enlighten me?

Thank you in advance!

 

[dfwnoob]

They're both the same heat pump.

R = Raypak branded
M = Rheem branded

Ti = Titanium heat exchanger.

 

[gdo]

They're both the same heat pump.

R = Raypak branded
M = Rheem branded

Ti = Titanium heat exchanger.

Thank you! That is very helpful.
Any clue what the E means? (maybe that's the "Exchanger" part of ti-E?)