The wall thickness is .0625” ...if the od is .375” and the id is .250” that means the combined wall thickness across the tube is .125”, correct?

You’re correct... .0625 (left wall) + .250 (ID) + .0625 (right wall) = .375 (OD) ...people are forgetting that 2 walls impact difference between ID and OD. So that .125 needs divided by 2 as you said.

Is this a 3/8" OD coil, w/ 1/8" ID? OD is critical, ID is not so much. Wall thickness 0.20 Yes?

The coils we sale are 3/8" OD x 1/4" ID Wall Thickness 1/8" or .1250

I’m trying to make a pool heater. How much heat can this take?

Fair to good amount of heat depending on the application you intend to use to heat the water running thru it. I wouldn't put it in a fire pit and then try to circulate water thru it, lol. In my Herms set-up I run 212* through it when cleaning the one I use as a my wort chiller but in my mash-tun I use it to circulate water ~ 152* + or - 1-10* through the grain to hold my grain at temp depending on the style of beer I'm making . Unless you're worried about sanitation, I'd urge you to use COPPER and larger diameter tubing. Cheaper tubing, cheaper fittings and a larger dia. would be more efficient heating a larger amount of water. No idea what size pool you're trying to heat but if it's more than 20 gallons (my brewpot & mash-tun size) you might be waiting for a while....

What is the wall thickness of this tubing?

I do not have the specific specifications but it is very rigid tubing, it can be bent but it takes quite a bit of effort... We use these with a flexible tube to connect the coil to the tap.

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HomeBrewStuff Stainless Steel Tubing Coil - 3/8" x 50' - DIY Chiller, HERMS, or Moonshine Snake

Product ID: 3513541

📏50 feet length for versatile projects

♻️304 stainless steel for corrosion resistance & purity

🛠️3/8 inch rigid yet workable stainless steel tubing

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Description

🍺 Brew Bold, Chill Smart — Your Ultimate DIY Cooling Coil!

COMPACT YET MIGHTY - Coiled into a space-saving 8.5" diameter by 10" tall design, it fits neatly into coolers or HLTs without sacrificing chilling power.
SANITARY DURABLE - 304 stainless steel ensures no corrosion, no off-flavors, and long-lasting performance for your brewing or distilling setup.
ENDLESS DIY BREWING POWER - 50 feet of premium 304 stainless steel tubing lets you craft custom chillers, HERMS coils, or moonshine snakes with ease.
PERFECT FIT FLEXIBILITY - 3/8" diameter tubing balances rigidity and bendability—shape it by hand or with simple tools for a flawless installation.
PLUG PLAY COMPATIBILITY - Works seamlessly with standard compression fittings or clamps—no special adapters needed to get your system running fast.

HomeBrewStuff's Stainless Steel Tubing Coil offers 50 feet of 3/8" diameter 304 stainless steel tubing, coiled into a compact 8.5" x 10" form. Designed for home brewers and distillers, it delivers a perfect balance of rigidity and flexibility, enabling easy shaping for custom chillers, HERMS systems, or moonshine snakes. Its corrosion-resistant, sanitary material ensures pure flavor and durability, compatible with standard fittings for quick setup.

Specifications

ASIN	B00420V094
Best Sellers Rank	#479,931 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #1,035 in Beer Brewing Kegs & Kegging
Date First Available	September 5, 2010
Is Discontinued By Manufacturer	No
Item Weight	3.99 pounds
Item model number	H680
Manufacturer	Home Brew Stuff
Product Dimensions	10 x 10 x 10 inches

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