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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Eastman Thermal Expansion Tank, 4.5 gal, 3/4 in MIP Connection, 60023

Eastman Thermal Expansion Tank, 4.5 gal, 3/4 in MIP Connection, 60023

Product ID: 14210411

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Details

Brand
Eastman
Product Dimensions
11.1"W x 16"H
Special Feature
Thermal
Color
White
Maximum Temperature
210 Degrees

🔥210°F max temp rating

🔩3/4 in MIP connection

⚙️4.5 gal capacity

Description

🔥 Protect your water heater like a pro — no leaks, no stress! ⚙️

BUILT TO LAST - Durable butyl rubber diaphragm paired with 304 stainless steel connection ensures long-term reliability.
PLUG PLAY READY - Factory pre-charged at 40 PSI for hassle-free installation and immediate protection.
COMPACT EFFICIENT - Sleek 11.1"W x 16"H design fits seamlessly into your indoor setup without clutter.
PEACE OF MIND WARRANTY - Backed by a 6-year limited warranty, because your home deserves dependable protection.
PRESSURE PROOF PERFORMANCE - Rated up to 150 PSI to safeguard your water heater from damaging pressure spikes.

The Eastman Thermal Expansion Tank (4.5 gal) is engineered to prevent excess pressure from thermal expansion in residential water heaters. Featuring a durable butyl rubber diaphragm and 304 stainless steel connection, it withstands up to 150 PSI and 210°F. Factory pre-charged at 40 PSI and equipped with a 3/4 in MIP connection, it offers easy installation and reliable performance, all backed by a 6-year limited warranty.

Specifications

Brand	Eastman
Product Dimensions	11.1"W x 16"H
Special Feature	Thermal Expansion
Color	White
Maximum Temperature	210 Degrees Fahrenheit
Style	Indoor Installation
Maximum Pressure	150 Pound per Square Inch
Mounting Type	Wall
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