Specification

Superior design combined with industry leading eciency
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. Choose from 5
elements. Each uses our standard 18 gauge cover.
Element
Model
Alum./Steel Fin
Dimensions
Thickness
Fin
Spacing
Fins/Ft.
H W
Hi-Output 958-2 2
1
⁄2" 3
1
⁄4" 0.015 55
Hi-Output 958-3 2
3
⁄4" 3
1
⁄4" 0.020 54
Hi-Output 958-4 3" 3
1
⁄4" 0.026 48
Hi-Output 958-5 3" 3
1
⁄4" 0.020 54
Note: All element models are natural nish.
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 ow rate through a baseboard unit in a completely designed hot water heat-
ing system is greater than the standard ow rate (1 GPM), the rating of that unit may be increased by
multiplying the standard rating at 1 GPM by the factor shown for the calculated ow rate.
Residential / Light Commercial for
Hot Water or Steam
HI-OUTPUT 9582 (STANDARD ELEMENT)
TABLE 3 — HEATING CAPACITIES, BTU PER HR. PER LIN. FT. 65° ENTERING AIR TEMPERATURE
Nom.
Tube
Size
Thick-
ness
Alim Fin
Dimensions
Fin/Ft.
Water
Rate
GPM
Hot Water
Average Water Temperature °F
H W 90° 100° 110° 120° 130° 140° 150° 160° 170° 180° 190° 200° 210° 220° 230° 240°
3
⁄4"
Copper
0.015 2-
1
⁄2" 3-
1
⁄4" 54.5
4 100* 170* 240* 320* 410* 500* 590 700 790 900 1,000 1,110 1,200 1,310 1,420 1,510
1 95* 160* 230* 310* 390* 470* 560 660 750 850 950 1,050 1,140 1,240 1,340 1,430
* Ratings at 140°F and lower temperatures determined by multiplying 150°F rating by the applicable reduction factor.
All the above 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 3 for two flow rates: 1 GPM and 4 GPM. The use of 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 ratings at the standard flow rate of 1 GPM must be used.
HI-OUTPUT 958-2
(Standard Element)
HI-OUTPUT 958