Planning FAQ:

  • What size heating system do I need?

    Use our design wizard — it runs Manual J calculations, accounting for heat loss, and determines the BTUs needed per hour for your space.

  • Steph and Randy are going over plans with their contractor

    How do I insulate for in-floor heating?

    There are several approaches to insulating for in-floor and radiant heat that also help save energy. See our insulation design guide for the options.

  • Can I use Heat-Sheet as a radon mitigation barrier?

    Yes — you'll need two layers of Heat-Sheet (the bottom layer flipped upside down) with 6 mil polyethylene sandwiched between them. Full details are in our radon mitigation guide.

  • What flooring can I use, or can I retrofit an existing home?

    In-floor heating installs easiest in concrete, but there are options for second stories and older homes too. See our flooring options guide for what works with your setup.

  • Where can HUG Hydronics be used?

    Pouring a new slab-on-grade is the easiest and fastest install, but the system also works installed on top of existing floors or under joists. See the full list of applications.

  • What heat source is right for my home?

    Our wizard can help you choose the right boiler. You can also connect the HUG tank to a wood boiler, solar thermal, or a heat pump — see our heat source selection guide.

  • Should I use a regular thermostat or a smart thermostat?

    Both work well. A standard thermostat is great for a simple system; a smart thermostat is worth it if you want remote control. See our thermostat choice guide for the trade-offs.

  • How do I lay out PEX pipes?

    Layout can be as simple as spray-painting your plan directly on the floor, or more involved depending on your zones' shape and size. See our PEX layout guide for pointers.

  • Where should I place the HUG Hydronics unit?

    Anywhere on an even surface — under stairs, in a closet, a utility room, or on a shelf all work. The most common place is right on the cement floor. See our unit placement guide.

  • What tools do I need to install my system?

    A small screwdriver, wire strippers, something to cut PEX pipe, and a pair of pliers — that's the full tool list. See our tools guide for details.

Which Control Board Do I Have?

HUG Hydronics systems ship with a white control board as of 2025. If you have an older system, you may have the green control board instead — check inside your unit to confirm which one you have.

  • New system, or bought recently? You almost certainly have the white board — use the White Board section below.
  • Had your system a while, or not sure? Open the unit and check the board color directly, then use the matching section below.

Using the wrong manual can lead to incorrect wiring or settings, so confirm before you start.

White Board Information

Green Board Information

Trouble Shooting & Maintenance

How-To Videos