We clean your pipes, not your pocket! Available in select areas of. My gas bills are much less now that i have a combi boiler and the constant hot water is great i do agree about the reduced water flow in running a bath, it takes forever but hey, not a problem if you prefer showers. You typically would have ducts in your home that lead to vents in the wall, ceiling or on the floor that your heat and/or central air flow out of. to drink orange juice? Reline existing.