The one I currently have is a 5 gallon, is this ok to replace with?

They don't rate these things by the gallon in particular, although this size will just fit into a 5 gallon pail. I believe the actual model number is roughly equal to the cubic feet of water within the system. (boiler, heat coils, radiators, pipes, etc) This is a common size for the typical 2,000 - 3,000 sq ft home with a hot water boiler rated around 150,000 - 175,000 BTUs. A smaller home with old fashion cast iron radiators instead of baseboard will need this size expansion tank due to the extra water in the system. If you have to fudge, the extra size doesn't hurt if you have the room.BTW, the comment on the BTUs of the boiler has more to do with the typical size / water capacity than anything else. There are "low mass" (read: small physical size) boilers than only hold a few gallons of water, which is much less than the usual 20 gallons or more for an old school system.

This tank shows a 4.4 gallon capacity.....

How long should a tank like this (Amtrak extol expansion tank) last. What is its estimated life?

Mine lasted almost exactly 2 years. Then a tiny pinhole leak on the outer part of tank started spraying water everywhere.

Does this replace a vent rite vr30f? how hard to replace?

It should be a direct replacement for any tank with a 1/2" male thread and similar exterior dimensions. (roughly 11" height x 11" width) It's not difficult at all provided you read the other questions / replies on this product to get a feel for what else you may need to do. I know myself and a few others posted detailed instructions a few months back. Remember that proper diagnosis is key for resolving the problem and there are several posts on how to figure out if the tank is actually the issue.

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102-1#30 EX-30 30 Extrol Expansion Tank

Product ID: 5148849

Details

Brand
Amtrol
Exterior Finish
Alloy Steel
Item dimensions L x W x H
11 x 11 x 15
Material
Alloy Steel
Vehicle Service Type
Multiple types

💧Watertight expansion reservoir

⚙️Heavy-duty steel tank

🛡️Pre-charged, sealed air cushion

₩250020

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Elevate your system’s efficiency with the legendary Extrol expansion tank!

READY TO GO - Factory pre-charged and 100% tested sealed air cushion for instant, reliable performance
ENERGY SMART - Controls system pressure to reduce energy consumption in heating and chilled water systems
BUILT TO LAST - Thick Butyl/EPDM diaphragm ensures unmatched durability and long service life
UNIVERSAL FIT - Compatible with multiple vehicle types and universal fit for hassle-free installation
TRUSTED LEGACY - Over 60 years as the world’s leading expansion tank brand—join the pros who rely on Extrol

The Amtrol 102-1#30 EX-30 is a robust, heavy-duty alloy steel expansion tank featuring a watertight reservoir and a thick Butyl/EPDM diaphragm for extended durability. Factory pre-charged and fully tested, it optimizes system pressure control to reduce energy consumption in heating and chilled water systems. With over six decades of trusted performance and universal compatibility, it’s the go-to choice for professionals seeking reliable, long-lasting water heater expansion solutions.

Specifications

ASIN	B000LDI9F4
Automotive Fit Type	Universal Fit
Best Sellers Rank	#53,831 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #29 in Power Water Pumps
Brand Name	Amtrol
Compatible with Vehicle Type	Multiple vehicle types
Customer Reviews	4.6 4.6 out of 5 stars (664)
Exterior Finish	Alloy Steel
Fit Type	Universal
Global Trade Identification Number	00642031113061
Included Components	Item
Item Dimensions	11 x 11 x 15 inches
Manufacturer	AMTROL
Manufacturer Part Number	102-1
Manufacturer Warranty Description	Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Material Type	Alloy Steel
Model Number	Amtrol 102-1 #30
Number of Items	1
OEM Equivalent Part Number	102-1
Product Grade	like new
UPC	642031395726 642031113061 784497649729
Unit Count	1 Count

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