Heat trap nipples are specialized fittings installed on the hot and cold connections of a water heater to reduce standby heat loss. Inside, a ball or flap lets water flow but blocks natural thermosiphoning that would pull heat out of the tank. They improve efficiency and can lower operating costs.
/hiːt træp ˈnɪpəlz/
Heat trap nipples are specialized fittings installed on the hot and cold connections of a water heater to reduce standby heat loss. Inside, a ball or flap lets water flow but blocks natural thermosiphoning that would pull heat out of the tank. They improve efficiency and can lower operating costs.
What do heat trap nipples do?
They prevent hot water from naturally rising out of the tank, reducing standby heat loss.
Source: The Cooling Company
Heat trap nipples reduce heat loss through piping.
In a garage-installed water heater, heat trap nipples keep hot water from rising into pipes, reducing reheating cycles.
Check heat trap nipples during water heater service and replace any that stick or clog.
“Check heat trap nipples during water heater service and replace any that stick or clog.”
Many modern water heaters include heat trap nipples from the factory.
Are heat trap nipples required?
Some codes or efficiency standards require them on new installations.
Can heat trap nipples be added later?
Yes. A plumber can retrofit them if space and piping allow.
Do heat trap nipples restrict water flow?
Properly sized nipples should not noticeably reduce flow.
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