Specifications

Residential Expansion Tanks
70-6910 261
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TK300 Series Expansion Tanks - Heating
Honeywell Expansion Tanks are designed to absorb hot water
expansion in closed heating systems. They are equipped with
butyl diaphragms to separate the air from the system water
(glycol). The tanks are a welded, not clamped design. Pre-
pressurized at 12 psi, the tank keeps fluids circulating and
maintains minimum system pressure. Honeywell tanks resist
waterlogging, loss of pressure through relief valve spills, loss of
BTUs and reduce circulator running time. Use the super efficient
Honeywell PowerVent or air vents to remove air and micro-bubbles
from the system for maximum performance.
• Butyl/EPDM diaphragm- 9 times better than natural rubber
• Deep-drawn steel tank
• Controls system pressure
• Air-tight cushion-factory pre-charged to 12 psig and 100% tested
Maximum Operating Temperature: 240 F (115 C)
Maximum Operating Pressure: 100 psi (689 kPA)
Materials: steel shell, heavy duty butyl diaphragm
Comments: Heating
Expansion Tank Sizing based on BTU’s
Product Number
Connection
Size (inch)
Connection
Type
Diameter Height Volume
Maximum
Acceptance
Volume Weight
(inch) (mm) (inch) (mm) (gal) (L) (gal) (L) (lb) (kg)
TK300-15 1/2 in. Male NPT 8 in. 203.2 mm 12 5/8 in. 321 mm 2.0 gal 7.6 L 1 gal 3.8 L 5 lb 2.3 kg
TK300-30 1/2 in. Male NPT 11 in. 279 mm 15 1/2 in. 394 mm 4.4 gal 16.7 L 2.5 gal 9.5 L 9 lb 4.1 kg
TK300-60 1/2 in. Male NPT 11 in. 279 mm 23 in. 584 mm 7.6 gal 28.8 L 2.5 gal 9.5 L 14 lb 6.4 kg
TK300-90 1/2 in. Male NPT 15 3/8 in. 390.5 mm 21 in. 533 mm 14.0 gal 53.1 L 11.5 gal 40.1 L 23 lb 10.4 kg
Boiler Type of Radiation
Net Output in 1000’s of
BTU/Hr
Finned Tube Baseboard
or Radiant Panel
Convectors or
Unit Heaters Radiators Cast Iron Baseboard Cast Iron
MBH Use Model Use Model Use Model Use Model
25 TK300-15 TK300-15 TK300-15 TK300-15
50 TK300-15 TK300-15 TK300-30 TK300-30
75 TK300-30 TK300-30 TK300-30 TK300-60
100 TK300-30 TK300-30 TK300-60 TK300-60
125 TK300-30 TK300-60 TK300-60 TK300-90
150 TK300-30 TK300-60 TK300-90 TK300-90
175 TK300-60 TK300-60 XPS-030V XPS-030V
200 TK300-60 TK300-60 XPS-030V XPS-030V
250 TK300-60 TK300-90 XPS-030V XPS-040V
300 TK300-90 XPS-030V XPS-030V XPS-040V
350 XPS-030V XPS-030V XPS-040V XPS-060V
400 XPS-030V XPS-040V XPS-040V XPS-060V