An easy way to determine whether it's time to change your whole house water filter(s) is…
Deluxe Wall Mounted Fan Forced Heaters
Commercial hydronic multi boiler install with allied electric boilers
The standard in water line is copper, always has been, but it is expensive and generally used in commercial applications and premium installations. Plastic water line is far more common and with the advances in pipe composition, almost as durable.
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Most manufacturers recommend annual service on all gas fired appliances and in some cases will void the warranty for lack of service. Regular maintenance can provide for better efficiency and prevent premature failure, both of which can result in substantial cost savings to the homeowner.
Standard 1" filters should be changed on average every three months. High capacity 5" filters should be checked after the first 6 months and changed within the year