Uni-Base 958 a

Residential/ Light Commercial for Hot water or Steam

Superior design combined with industry leading efficiency makes Haydon's Hi-Output 958 the best choice for both the specifying engineer and the heating contractor. Its durable construction with standard 18 gauge front cover makes the 958 ideal for demanding residential and commercial applications, and its reliability and quiet operation are a plus in every setting.

*Other element available.
*Stocked in 2-3-4-5-6-7-8-10 foot lengths, both complete (with elements) and enclosure only (less element).

Table 1 - Heating Capacities, BTU per hr per lin. ft. 65 degrees entering air temperature I-B-R approved

model

Nom. Tube Size

Alum.Fin
Dimensions
H X W

Thick-
ness

Fin
Spacing
Fins/Ft.

Water
Rate
GPM

Hot Water Ratings
Average Water Temperature degrees F

Heat
Base
958-2

3/4"
CPR.

2 1/8" X 2 1/2"
Natural Finish

.015

150	160	170	180	190	200	210	220	230	240
590	700	790	900	1000	1110	1200	1310	1420	1510
560	660	750	850	950	1050	1140	1240	1340	1430

Heat
Base
958-1

3/4"
CPR.

2 1/8" X 2 1/2"

.008

150	160	170	180	190	200	210	220	230	240
480	560	790	900	1000	1110	1200	1310	1420	1510
560	660	750	850	950	1050	1140	1240	1340	1430

Heat
Base
958-3

1"
CPR.

2 3/4" X 3 1/4"

.015

150	160	170	180	190	200	210	220	230	240
590	700	790	900	1000	1110	1200	1310	1420	1510
560	660	750	850	950	1050	1140	1240	1340	1430

Heat
Base
958-4

1 1/4"
Steel

3 1/4" X 3 1/4"

.029

150	160	170	180	190	200	210	220	230	240
590	700	790	900	1000	1110	1200	1310	1420	1510
560	660	750	850	950	1050	1140	1240	1340	1430

Heat
Base
958-5

1 1/4"
CPR.

3" X 3 1/4"

.015

150	160	170	180	190	200	210	220	230	240
590	700	790	900	1000	1110	1200	1310	1420	1510
560	660	750	850	950	1050	1140	1240	1340	1430

All the above I-B-R Ratings are based on active length, which is 3" less than total length, and includes a 15% addition for heating effect.
Ratings: Heating capacities are listed in Table 1 for two flow rates: 1 GPM and 4 GPM. The use of I-B-R Ratings at 4 GPM is limited to installations where the water flow rate through the baseboard unit is equal to or greater than 4 GPM. Where the water flow rate through the baseboard is not known, the I-B-R Ratings at the standard flow of 1 GPM must be used.

Table 2 - Factors for ratings at flow other than standard and pressure drop values
Rate of Flow GPM	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0	6.0
Factor	1.000	1.016	1.028	1.038	1.045	1.051	1.057	1.062	1.067	1.074
Pressure Drop 3/4" Tube Mill inches per ft.	47	96	157	230	320	420	525	650	775	1060

Note: If the calculated water flow rate through a baseboard unit in a completely designed hot water heating system is greater than the standard flow rate (1 GPM), the rating of that unit may be increased by multiplying the standard I-B-R Rating at 1 GPM by the factor shown for the calculated flow rate.