I fill a 5 gallon home depot bucket with water at desired temp and pump it into the the tank with a smartpond pump via tubing clamped into the tank. I adjust the flow so that its pumping at the same rate the faucet is filling it and treat it while its in the bucket. My faucets can't handle a python but this is the same thing and the pump and tubing were pretty cheap.
This is the pump I use:
https://www.lowes.com/pd/smartpond-300-GPH-Submersible-Fountain-Pump/1000597013?cm_mmc=shp-_-c-_-prd-_-lwn-_-google-_-lia-_-243-_-pondsandfountains-_-1000597013-_-0&placeholder=null&gclid=Cj0KCQjw-uH6BRDQARIsAI3I-Ud6PqwovNolPPXp8BL5Y_tUEAsIeYXhHSTUYKwOSE_6t6WZuFuuoWYaAnmOEALw_wcB&gclsrc=aw.ds
Real easy as described here: