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PIPING
PART 5. PIPING THE MUNCHKIN VWH TO THE STORAGE TANK
The Munchkin is designed to be connected to a storage tank to supply domestic hot water. Heat
Transfer Products has available storage tanks that are 80/119 gallon size storage tanks constructed in
either Stainless Steel or Glass lined construction. These storage tanks will be directly connected to the
Munchkin VWH supply and return connection. Connect the cold water supply to both the storage
bottom port and the supply side of the Munchkin VWH (shown in Piping details, this section) It is
important that you install a flow check on the supply line of Munchkin VWH before you connect feed
line to the storage. This will allow the cold feed to flow through the storage tank first and not the
Munchkin VWH. It is recommended that you install shut off valves on the cold feed line for ease of
future service. If there is a back flow preventer, or any type of no return valve in the system, then you
must install an additional tee for a suitable potable hot water expansion tank. Connect the Storage tank
return line to the return connection located on the Munchkin VWH (shown in Piping details, this
section). Then connect your hot water outlet located on the storage tank to your hot water plumbing
lines.
A. EXPANSION TANK
A potable hot water expansion tank my be required to offset the water expansion as the water is
heated. In most city plumbing systems, the water meter has a no return or back flow device built into
the system to prevent a back flow of water back into city mains. Some states require back flow pre-
venters on all incoming water supplies. Under these circumstances, you will need a hot water expan-
sion tank listed for potable water use. The expansion tank should be located on the cold inlet piping
close to the water heater. It is important that you follow the expansion tank manufacturer’s installa-
tion guidelines when installing any expansion tank.
See the piping illustrations included in this section, Figs. 5-2 to 5-9 for suggested guidelines in
piping the Munchkin heater with either zone valves or circulator pumps.
*Please note that these illustrations are meant to show system piping concept only, the installer
is responsible for all equipment and detailing required by local codes.
B. HIGH VELOCITY CIRCULATOR PUMP
Every Munchkin VWH is shipped with a high velocity circulating pump to assure the correct amount
of continuous flow through the all stainless steel heat exchanger at all times. If a replacement of the
high velocity circulator pump is needed, it must match the performance of the pump provided with
the Munchkin VWH package. NOTE: The circulator must be designed for potable water systems.
WARNING
Plumbing of this product should only be done by a qualified, licensed plumber in
accordance with all local plumbing codes.
WARNING
NEVER USE DIELECTRIC UNIONS OR GALVANIZED STEEL FITTINGS WHEN
CONNECTING TO A STAINLESS STEEL STORAGE TANK.
WARNING
When raising tank temperature, you increase the risk of scalding – Please use a water
tempering or mixing valve and extreme caution. Consult codes for conformance.