There is no separate header tank and heating coil inside the hwc as in modern systems.
Hot water heating coil piping diagram.
After heat is released the water returns to the boiler to be reheated and recirculated.
The garn unit all related heating equipment including pumps piping fan coils hot water baseboard radiant floor heating systems etc and all electrical equipment including power wiring controls control wiring back up electric heating etc must be installed by a qualified installer or competent licensed personnel in strict compliance.
Hot water heating systems figure below transport heat by circulating heated water to a designated area.
If a manual or automatic control valve is placed in the branch piping path the water flow through a given heat emitter can be fully controlled.
For hot water coils control valves are available normally open.
This is a diagram of the obsolete one pipe pumped system.
All ball isolation valves are furnished with an adjustable memory stop feature and may be used as a balancing valve.
Back to product literature piping diagrams commercial electric heat pump commercial tank type electric commercial tank type gas commercial tankless domestic.
Old unmodified gravity systems are usually direct which means the water from the hot taps and hot water cylinder is the same water that is circulating through the radiators.