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Domestic Water System Requirements:
NOTE: Please note that it may be necessary to utilize an accu-
mulator tank within the domestic water system. Refer-
ence Figure 30. Although the Aqua-Hot is equipped
with a pressure-relief valve, the use of an accumulator
tank will help prevent excessive "weeping" of the valve.
Manufacturers of pressure-relief valves indicate that
excessive weeping of these valves will cause the "seat"
in the valve to deteriorate, and, in turn, the valve will
fail prematurely. For additional information regard-
ing accumulator tanks, please be sure to reference the
Recreational Vehicle Industry Association's (RVIA)
technical publication titled "Recreational Vehicle
Plumbing Systems." To obtain a copy of this particular
publication, please contact RVIA at (703) 620-6003 or
visit them online at www.rvia.org.
Use the RVIA-provided table below in order to deter-
mine the proper sizing of pipe and tubing required to
ensure maximum efficiency.
The size of water supply piping and branch line shall
not be less than specified in the table below.
NOTE: A water heater or ice maker shall not be counted as a
"water-using fixture" when computing pipe sizes.
Minimum Size Tubing and Pipe for Water Distribution Systems* Table
Number of
Fixtures
1
2
3
4
5 or more
*
Minimum size for toilet water supply line shall not be less than the size recommended by the toilet
manufacturer.
**
12-feet (3.7 m) maximum length allowable only from water service connection to a single fixture.
***
6-feet (1.8 m) maximum length.
Section 4: Domestic Water System
Tubing
Inner Dia.
(inches)
1/4**
1/4***
3/8
3/8
1/2
© 2008 Aqua-Hot
®
450-DE/DM Hydronic Heating System Installation Manual
NOTE: As stated directly from the ANSI A119.2/NFPA 501C
Standard on Recreation Vehicles, 1993 Edition:
"Piping Systems shall be sized to provide an adequate quantity
of water to each Plumbing Fixture at a flow rate sufficient to
keep the Fixture in a clean and sanitary condition without any
danger of back-flow or siphoning."
NOTE: The Aqua-Hot is equipped with a pressure-relief valve,
which releases excessive pressure in the domestic water
system, as well as a tempering valve in order to regulate
the temperature of the hot water.
Domestic Water System Plumbing:
1.
Connect a domestic water plumbing line from the do-
mestic water demand pump/water manifold to the cold
water inlet port on the Aqua-Hot. Reference Figures 29
and 30.
2.
Connect a domestic water plumbing line from the
Aqua-Hot's hot water outlet port to the hot water
system's distribution lines/water manifold. Reference
Figures 29 and 30.
Outer Dia.
(inches)
3/8**
3/8***
1/2
1/2
5/8
Pipe
Iron Pipe Size
(inches)
3/8
3/8
1/2
1/2
1/2
— Page 20 —
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