Custom HERMS Coil

50 foot custom stainless steel HERMS coil   

Our price: $160 USD

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Ships via USPS or UPS from our US manufacturer (Spike Innovations LLC) in Maine. Tracking is included on all orders. 

Due to the custom nature of this product, please allow up to 1 week for the product to ship. All sales are final. All timeframes are estimates.

This product is intended for experimental home use only. No warranty or guarantee of suitability (express or implied) is given for commercial use of this product. Not for commercial resale without prior written consent.

Payment methods include PayPal and all major credit cards (PayPal account *not* needed to pay by credit card). Our payment processor will automatically convert the amount to your local currency.


Coiling the HERMS coil has proven to be one of the most difficult aspects of building our brewery for many users (see some of the failed attempts).

We offer custom stainless steel HERMS coils that have been professionally manufactured to our specifications by a US-based stainless tubing company, ready for use in our electric brewery setup.

These coils are easy to install even in tight kettles due to the cross-over design. Having the ends come from the opposite sides of the coil allows for more flex simplifying installation.

The longer 50 foot length ensures that heat transfer is maximized and the large 1/2 inch tubing minimizes flow restriction.


What size do I need?

Two sizes are available:

  • STANDARD: 15.5" diameter, 7" high (measurements taken center of tubing to center of tubing). Will work in any kettle with an inner wall diameter of at least 16" such as the 20 gallon Blichmann Boilermaker kettles (or larger). The holes in the kettle wall should be 7" apart (center to center), however we recommend you wait to receive your coil to confirm before punching your holes.
  • SMALL: 11.25" diameter, 9.5" high (measurements taken center of tubing to center of tubing). Will work in any kettle with an inner wall diameter of at least 11.75" such as the 10 gallon Blichmann Boilermaker kettles or 15 gallon kegs (keggles). The holes in the kettle wall should be 9.5" apart (center to center), however we recommend you wait to receive your coil to confirm before punching your holes.

The ends of the coil extend approximately 2" past the diameter to allow the user to cut to the exact length they need as every kettle will be slightly different. Cut the ends using a hacksaw and file the edges smooth with a metal file so that there are no burrs. If you want to get a nice clean cut, use a stainless steel tubing cutter instead as it will create a perfect cut without burrs.



  • Total length: 50 feet
  • Material: 1/2 inch OD 304 stainless steel, 0.035" wall thickness.
  • Ends: Bent at a 90 degree angle to exit straight out of kettle wall, lining up perpendicular with each other.

Installation instructions are available in our Complete Guide to Building your Home Brewery or online here.



Standard 15.5" diameter coil:

Placed temporarily inside a 20 gallon Blichmann Boilermaker kettle to show relative size:


Visit the official Custom HERMS Coil product thread in our forum.

Questions? Email us at



DISCLAIMERS: When purchasing you will be paying our manufacturer (Spike Innovations LLC) directly and the product will be shipped directly by them from Maine USA. We work with our manufacturer to ensure that you are completely satisfied with all purchases made through

Duties, taxes, and other customs fees charged on internationally shipped orders are the SOLE responsibility of the buyer. or Spike Innovations LLC are unable to provide estimates for any customs fees, taxes, or duties; check with your country's local customs office for more information about importing goods into your country.

Product warranties may be revoked if or Spike Innovations LLC determine that product faults are due to misuse, abuse, or improper connection. Buyer agrees that, the owner, the webmaster, and Spike Innovations LLC shall not be liable for either specific performance or any liability, loss, tampering, abuse, damage, including consequential and incidental damages, arising out of buyer's purchase of the equipment, or any defects in the equipment.