HUUM UKU Extension Box (Contactor, 12 kW+)

This is the HUUM UKU extension box — the contactor you add when the heater is over 12 kW. On this shop that means HIVE 12 / 15 / 18. It is not a control panel and it is not a heater. UKU WiFi (any finish) is sold separately; this box rides with that system.

What’s included

• HUUM UKU extension box / contactor enclosure
• UKU control sold separately
• Heater sold separately

Specs

• Brand: HUUM (Estonia)
• Model: UKU extension box
• SKU: 536-UKU-EXT-BOX
• Type: Contactor / extension module for UKU
• Required with: UKU on HUUM heaters over 12 kW — HIVE 12 / 15 / 18 on this shop
• Not required with: DROP, HIVE Mini (6 / 9 / 11), CLIFF, STEEL, CORE (all ≤ 11 kW in our list)
• UKU with this box (HUUM US): up to 18 kW
• Control panel in the carton: No
• Heater in the carton: No

Downloads

• HUUM UKU extension box US wiring instructions (PDF)
• HUUM UKU 4.1 US user manual (PDF)

FAQ

Does this replace UKU?
No. You still need a UKU WiFi (or Local) package. This is the extra box for 12 kW+.

HIVE 12STUX package?
STUX already names UKU. Confirm with our team whether today’s carton also has the extension box before you add this SKU.

Wood stove?
No. HIVE Wood does not use UKU.

Email hello@selfcaresaunas.com if you want him to pair UKU with a HUUM heater size. A licensed electrician completes the hookup from the HUUM table — we do not invent amps.

Questions? Email hello@selfcaresaunas.com or email hello@selfcaresaunas.com.