SUNPACK® SUNPAD™ Pro Commercial Heat Mat Add-On — 21 in x 60 in

Add-On Unit for Extending a SUNPAD Pro Commercial Heat Mat Chain

The SUNPACK SUNPAD Pro Commercial Heat Mat Add-On extends an existing SUNPAD Pro Commercial system (master unit SPPSP10150, sold separately) with another 21in x 60in section of heated bench. Daisy-chaining up to four add-on units to a single master lets a grower cover a long propagation bench with continuous bottom heat while running only one power connection for the entire chain.

Because the add-on draws its power through the master unit rather than needing its own outlet, a grower can extend a heated bench in 21in x 60in increments without running new electrical wiring for each section. Up to four add-ons can be daisy-chained to one master unit, covering a substantial bench length from a single power source.

Key Features & Benefits

• 21in x 60in matching format — Matches the master unit's footprint so a chained bench heats evenly across every section.
• Daisy-chain add-on design — Connects to a SUNPAD Pro Commercial master unit (SPPSP10150, sold separately) and draws power through the chain rather than its own outlet.
• Up to 4 add-ons per master — Lets one master unit's power connection support a substantial run of heated bench space.
• Bottom heat that matches the master — Brings the same above-ambient warmth to the growing medium in this section as the rest of the chained bench.
• Built for the same wet bench conditions — Shares the master unit's waterproof, commercial-grade build, so it stands up to the same overhead watering and bench traffic.

Who Should Use This

This add-on is for growers who already run, or are installing, a SUNPAD Pro Commercial master unit and need to extend heated coverage further down the bench. It is sold separately from the master unit and cannot power a bench section on its own.

Before You Order

This add-on requires a SUNPAD Pro Commercial master unit (SPPSP10150, sold separately) already installed; it will not heat a bench section on its own. Confirm how many add-ons are already connected to the master before ordering, since each master supports a maximum of four.

Frequently Asked Questions

How many add-on units can one master unit support?

One SUNPAD Pro Commercial master unit (SPPSP10150) supports up to four add-on units connected in a daisy chain. Beyond that count, a second master-and-add-on chain is needed for additional bench coverage.

Can this add-on be used without a master unit?

No. The add-on has no independent power connection and must be daisy-chained to a SUNPAD Pro Commercial master unit (SPPSP10150, sold separately) to receive power and heat a bench section.

Does the add-on match the master unit's heat output?

Yes. The add-on shares the same 21in x 60in format and root-zone heat output as the master unit, so a chained bench warms evenly across every connected section.

When would I add a second add-on instead of buying another master unit?

Add a second add-on whenever the existing master still has capacity under its four-unit limit, since running power through the chain avoids installing a new outlet. Once a master already supports four add-ons, a new master-and-add-on chain is required instead.

Is this add-on waterproof like the master unit?

Yes. The add-on uses the same waterproof, commercial-grade construction as the master unit, built for the frequent overhead watering typical of greenhouse bench propagation.