A recent trend with HMA filters has been to rig them up to a warm water source so as to add large amounts of filtered water directly to your tank. Here at DD will still use cold water as our systems are drip fed 24/7 - however a long term customer of ours, Brent Sapsed
, has written this article to explain how he has achieved pre-heating his water change water to 30-C using a domestic combination boiler, a mains cold supply, a TMV, some additional pipework and John Guest fittings.
Brent runs a popular Discus group "Discus Revolution" on Facebook, it is a closed group so if you have a FB account and would like to join .... Discus Revolution Facebook page..
1/ The water flowing through the filter must never exceed the maximum temperature advised by the manufacturer. Keeping at 28 to 30 degrees C makes perfect sense especially if adding to an aquarium housing fish etc
2/ 3/8" John Guest fittings and tube is recommended, otherwise you may not get the flow to ignite the boiler - consult your boiler manual for minimum flow requirements.