Roberts Gorden NDUSTRIA NHE Series Installation, Operation & Service Manual page 16

NHE-S I , O
ERIES NSTALLATION PERATION AND
Table 3: Component Package Guide
Model
NHE-40
NHE-60
NHE-80
NHE-100
NHE-125
NHE-150
NHE-175
Although not recommended, additional tube lengths may be added to the heater. Tubing must be aluminized
(heat-treated), or porcelain coated. Additional tube lengths beyond the specified minimum tubing length are
considered vent pipe for length determination. Maximum vent length allowed is 45' (13.7 m) total.
12
S M
ERVICE ANUAL
Tubing Length
Minimum
10' (3m)
20' (6m)
20' (6m)
30' (9m)
30' (9m)
40' (12m)
50' (15m)
Standard Core Packages
Aluminized
CP10ALUM
CP20ALUM
CP20ALUM
CP30ALUM
CP30ALUM
CP40ALUM
CP30ALUM + EXP20ALUM
Stainless Steel
CP10ALUM
CP20ALUM
CP20ALUM
CP30ALUM
CP30ALUM
CP40ALUM
CP30ALUM + EXP20ALUMSS