Hi - I have put a Gloworm ultrapower sxi with a 170 ltr combined tank in my new build (3bed 2 showers plus bath etc). Was wondering if any heating guys have fitted one of these yet and if they have had any call backs or faults. Mine seems good so far but havent run it for long as propert still empty. Also would it be okay to add scale inibitor into one of the towel rails. Rads have been on and off and system drained for painting etc but has now been refilled for the last time. Many Thanks