Honeywell TK300 Series Catalog Page

Residential Expansion Tanks

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
Connection Type: Male NPT

Comments: Heating

Product Number

TK300-15/U 1/2 in. 8 in. 203.2 mm 12 5/8 in. 321 mm 2.0 gal 7.6 L 1 gal 3.8 L 5 b 2.3 kg

TK300-30/U 1/2 in. 11 in. 279 mm 15 1/2 in. 394 mm 4.4 gal 16.7 L 2.5 gal 9.5 L 9 b 4.1 kg

TK300-60/U 1/2 in. 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/U 1/2 in. 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

Connection
Size (inch)

Diameter Height Volume

inch mm inch mm gal L gal L lb kg

Maximum
Acceptance Volume Weight

Expansion Tank Sizing based on BTU’s

Boiler Type of Radiation

Net Output in 1000’s of

BTU/Hr

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

Finned Tube Baseboard

or Radiant Panel

Convectors or

Unit Heaters Radiators Cast Iron Baseboard Cast Iron

230 customer.honeywell.com 70-6910