HotLine video shows you how to measure your water line for a typical residential or commercial inside-the-pipe water pipe heater.

Installation Criteria

To install the HotLine heating element successfully in the incoming water line, the line should be at least a ¾″ minimum diameter pipe with long sweeping bends.

The water pipe must be clear and open from the water main, water meter or shut off valve box, into the warmth of the home.

The HotLine heating element cannot be installed through valves or sharp bends. Minimum radius of any bends needs to be at least 4″.

For copper and iron pipe, the HotLine heating element can only be used in cases of straight runs, as the HotLine Internal Pipe Heater element will not make the sharp bends of copper or iron elbows.

The HotLine heating element can not be retrofitted to fit into existing outside wall distribution piping, unless the original installation was designed to accept the HotLine heating element. Considerations include adequate pipe size (¾″), access to the end of the pipe, and straight runs without elbow and shut off valves.

Requirements to determine the length of the Hotline heating element:

To measure for the required length of HotLine heating element, it will be necessary that the proper tools be used to determine the clear inside length of the water pipe to be protected.

HotLine heating elements are engineered for the specific length ordered and can not be modified or cut after manufacturing.

The most accurate way is to use an electrician's fish tape. This item can be purchased at most hardware or home construction supply stores.

If Item #(B) and #(C) as noted below and on the below drawing are not installed, they need to be installed by the owner or installer to help determine the correct length required.

Pre-installation Items You Need

  1. Water service line from meter to building.*
  2. ¾″ x ¾″ x ¾″ Tee. If this does not exist, it needs to be installed before measuring.**
  3. Fitting Adapter. ½″ plug to be installed after measurements are taken.**

* Item A is assumed to be existing.

** If Items B and C are not existing, these fittings will be installed by the owner or installer to facilitate access for measuring length required and insertion of HotLine heating element.

Tools Required

  • 6′ - 100′ (plus) electrician's fish tape
  • 6′ - 100′ (plus) tape measure
  • Assorted standard plumber's tools, cleaning brushes, flux, solder, torch, and other tools necessary to install Tees and or fittings to properly measure the length required.

Measuring Procedure (See component diagram below )

  1. Insert the electrician's fish tape through the bushing #(D) and flush adapter fittings #(E) until it hits the closed valve.
  2. Pull back the electrician’s fish tape 2 inches and mark at the face-edge of the flush adapter fitting.
  3. Then pull back the electrician’s fish tape approximately 2 feet and reinsert to verify the first measurement was correct.
  4. Remove the tape and lay out straight on a flat surface.
  5. Measure the fish tape with a continuous tape measure to determine the correct length required.
Print Water Measure Instructions

Component Diagram

HotLine Water Hookup Diagram

Download large image pdf

If you have questions, please contact HotLine at (877) 881-2980 or contact us on our contact page