When I ordered my T8 I just called AP and spoke with them about the RHP. They said to call Pro Products and let him know what tank you're ordering and he will recommend the RHP size. I had my RHP shipped to AP for AP to install in the tank (RECOMMENDED). When it came in, everything was mounted, I just had to build up the tank and seal the corners then let dry and degas over the next few days. GREAT PRODUCTS. My tank sits with the RHP plugged into a thermostat with the probe on the cold side set to 80F.

I generally see 88-92F hot side and 78-82F cold side.

I have her water halfway under the RHP to aid in humidity. This has my tank at 65% on the hot side and 80% on the cold side.

She has absolutely perfect shed's ever since I got this tank in place.