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        • Modern curves and a ridged shoulder make Neptune a bold feature in contemporary interiors.

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        • Perfectly cylindrical, 1 inch diameter columns with clean, symmetrical tops and bottoms.

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Clean curves

This modern take on the classic Princess radiator is designed with cutting-edge technology. This allows tradition and modernity to collide, creating an exceptional radiator for remarkable interiors. 

Built for steam

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Neptune II

Available in 4 heights
Model H D SMAX
Neptune II 21in 21 in 7.1 in 14
Neptune II 24in 24 in 7.1 in 12
Neptune II 28in 28 in 7.1 in 10
Neptune II 36in 36 in 7.1 in 9
H Radiator height
D Radiator depth
SMAX Maximum size for delivery in one piece (number of sections)

All models are available up to six feet six inches (24 sections) in length. Radiators that exceed the maximum size for delivery in one piece (SMAX) are delivered in two or more pieces for partial home assembly.

Extraordinary finishes

We make Neptune in over 60 signature finishes as well as the complete Farrow & Ball® palette

Technical details

All-Family Measurements
Neptune II
For all models
Section length (LS) 3.19 in
Bushing length (LB) 0.5 in
Bottom inlet to floor (HBI) 4.1 in
Max working pressure 116 psi (Hydronic)
Max working pressure 30 psi (Steam)
Connections available 1¼”, 1″, ¾”, ½” NPT
Subgroup Depth (D) Pipe center to wall (PW)
Neptune II 7.1 in 4.1 in

Radiator length is number of sections multiplied by the section length, plus the length of the two bushings.

(NS × LS) + 2LB

Code Model Height (H) Depth (D) Length (LS) Weight (WS) Volume (VS) Top inlet (HTI) EDR Hydronic (EH) Steam (ES)
CI/NE2/520 Neptune II 21in 20.5 in 5.5 in 3.19 in 16.3 lbs 0.47 gal. 18.2 in 2.30 sq.ft. 345 BTUs 552 BTUs
CI/NE2/620 Neptune II 24in 24.4 in 5.5 in 3.19 in 19.8 lbs 0.57 gal. 22.2 in 2.76 sq.ft. 414 BTUs 662 BTUs
CI/NE2/720 Neptune II 28in 28.3 in 5.5 in 3.19 in 23.8 lbs 0.67 gal. 26.2 in 3.32 sq.ft. 498 BTUs 797 BTUs
CI/NE2/920 Neptune II 36in 36.2in 5.5 in 3.19 in 26.9 lbs 0.91 gal. 34.1 in 4.31 sq.ft. 646 BTUs 1034 BTUs
H Radiator height (including feet)
D Radiator depth from wall / baseboard
LS Section length
LB Length of bushings
HTI Top inlet to floor
HBI Bottom inlet to floor
PW Pipe center to wall / baseboard
VS Internal volume per section
WS Empty weight per section
EDR Equivalence of direct radiation
ES Steam heat emission per section
Stated for steam temperature of 215°F at 1 psi with a room temperature of 70°F
EH Hydronic heat emission per section
Stated for water temperature of 170ºF and room temperature of 70ºF

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