is this for patable water?

Yes, this for use with potable water.

Is this for a 50 gallon tank?

If your water pressure is below 70 PSI, this tank will work. If it is 80 PSI, you will need the larger 4 gallon model. Refer to this guide http://media.wattswater.com/pg-thermexpansion.pdf/.

Do i need this if my boiler has one and water heater is close by

Heating boiler piping system is typically isolated from the water piping system for the rest of the house (such as by a pressure reducing or check valve to drop the house water pressure of ~ 60 psi to the typical less than 20 psi of the heating boiler side). Therefore the heating boiler expansion tank function would not effect the hot water boiler thermal expansion. Heating boiler thermal expansion tanks are typically factory charged to 12 psi while those for hot water tank are charged to 40 psi. ps I am not a professional so you may want to do more research of your own.

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🔥 Stay cool under pressure with Eastman’s sleek thermal expansion tank!

COMPACT YET POWERFUL - 16" x 11" footprint fits easily in tight indoor spaces without sacrificing capacity
ROBUST ALLOY STEEL BUILD - Durable steel and butyl rubber diaphragm ensure long-lasting performance
PERFECT FIT COMPATIBILITY - Designed for 50-100 gallon water heaters and boilers—seamless integration
TRUSTED BRAND RELIABILITY - Backed by Eastman’s decades of plumbing expertise for peace of mind
PRECISION PRESSURE CONTROL - Prevents dangerous pressure build-up for ultimate water heater safety

The Eastman 60023 Thermal Expansion Tank is a 4.5-gallon, steel-built solution engineered to protect your water heater by preventing backflow and pressure build-up. Featuring a high-quality butyl rubber diaphragm and 3/4-inch MPT connection, it supports water heaters and boilers between 50 and 100 gallons, operating safely up to 210°F. Compact and reliable, it’s a must-have upgrade for modern plumbing systems.

Specifications

Brand	Eastman
Product Dimensions	11.1"W x 16"H
Special Feature	Thermal Expansion
Color	White
Maximum Temperature	2.1E+2 Degrees Fahrenheit
Style	Indoor Installation
Mounting Type	connection mount
Is Electric	No
Manufacturer	EZ-FLO
Item Depth	11.5 inches
UPC	091712600237
Global Trade Identification Number	00091712600237
Part Number	60023
Item Weight	0.48 ounces
Item model number	60023
Is Discontinued By Manufacturer	No
Size	4.5 Gal.
Pattern	Solid
Shape	Cylindrical
Item Package Quantity	1
Certification	Steel Material
Special Features	Thermal Expansion
Included Components	Electrical & Heating;Door Chimes;doorbell-push-buttons
Batteries Included?	No
Batteries Required?	No

€ 170.74

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Eastman 60023 Thermal Expansion Tank, 4.5 Gal, 3/4 in Mpt, Steel, White

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