Specifications & Performance Claims
This model is efficiency rated. The efficiency rating is valid only at the minimum salt dose. This system has a
demand initiated regeneration (D.I.R.) feature that complies with specific performance specifications intended to min-
imize the amount of regenerant brine and water used in their operation.
This water softener has a rated softener efficiency of not less than 3,350 grains of total hardness exchange per
pound of salt (based on sodium chloride) and shall not deliver more salt than its listed rating or be operated at a
sustained maximum service flow rate greater than its listed rating. This system has been proven to deliver soft
water for at least ten continuous minutes at the rated service flow rate. The rated salt efficiency is measured by lab-
oratory tests described in NSF/ANSI Standard 44. These tests represent the maximum possible efficiency that the
system can achieve. Operational efficiency is the actual efficiency after the system has been installed. It is typically
less than the rated efficiency, due to individual application factors including water hardness, water usage, and other
contaminants that reduce a softener's capacity.
Model Code
Rated Softening Capacity (Grains @ Salt Dose)
Rated Efficiency (Grains/Pound of Salt @ Minimum Salt Dose)
Water Used During Regeneration @ Minimum Salt Dose
Total Water Used Per Regeneration @ Maximum Salt Dose
Rated Service Flow Rate
Amount of High Capacity Ion Exchange Resin
Pressure Drop at Rated Service Flow
Intermittent Flow Rate @ 30 psi
Water Supply Max. Hardness
Water Supply Max. Clear Water Iron
Water Pressure Limits (min. / max.)
Water and Ambient Temperature Limits (min. / max.)
Minimum Water Supply Flow Rate
Maximum Drain Flow Rate
*
Intermittent flow rate does not represent the maximum service flow rate used for determining the
softener's rated capacity and efficiency. Continuous operation at flow rates greater than the
service flow rate may affect capacity and efficiency performance.
**
Capacity to reduce clear water iron is substantiated by laboratory test data. State of Wisconsin
requires additional treatment if water supply contains clear water iron exceeding 5 ppm.
***
Canada working pressure limits: 1.4 - 7.0 kg/cm
This system conforms to NSF/ANSI Standard 44 for the specific performance claims as verified and
substantiated by test data.
Variable Salt Dose: The salt dose is selected by the electronic controls at regeneration time based
Contaminant
Barium
Radium 226/228
Questions? Call Toll Free 1-800-754-7027
When you call, please be prepared to provide the model and serial number,
on the amount needed.
PERFORMANCE CLAIMS
Influent Challenge Level
10 ±10% mg/L
25 pCi/L
found on the rating decal inside the salt lid.
42,400 @ 16.3 lbs.
2.5 gallons (9.5 L) / 1,000 grains
45.9 gallons (173.8 L)
9.9 gpm (37.5 lpm)
22.4 gpm (84.8 lpm)*
20 - 125 PSI (138 - 862 kPa)***
40 - 120 °F (5 - 49 °C)
.
2
Maxiumum Allowable
Product Water Level
2.0 mg/L
5 pCi/L
www.rheemwatertreatment.com
or visit
3
Model RHW42
rH42
12,400 @ 2.5 lbs.
29,900 @ 8.0 lbs.
5,010 @ 2.5 lbs.
1.20 cu. ft.
12.0 psig
140 gpg
11 ppm**
3 gpm (11.4 lpm)
2.0 gpm (7.6 lpm)