REHEAT · 1.5 ton
VKIN UCHA-18TDC 1.5-ton REHEAT heat pump for small grow rooms
The smallest of the REHEAT range — a full DC inverter heat pump that cools, heats, dehumidifies and ventilates one room while holding ±1°C and ±2% RH. Two indoor coils and two EEVs let it dehumidify to the humidity setpoint on one coil while recovering refrigerant heat on the other, so the room dries without being chilled and without an electric reheat element. Low-static concealed chassis with a five-speed DC motor.
Where it fits
Built for these rooms.
A built-in humidifier adds up to 4.22 pints of water an hour when the room runs too dry for young plants.
Cools, heats, dehumidifies and humidifies one room from a single low-profile concealed unit.
Low-static chassis (0–0.12 in W.C.) sized for units close to the room they serve. For long runs, step up to the UCHA-36TDC.
Hot-gas reheat
Dry the room, not the plants.
- Cool & dehumidify
The main indoor coil pulls water out of the air until the room hits its humidity setpoint (30–90% RH).
- Recover the heat
Hot refrigerant gas runs through a second indoor coil, so the heat the compressor already made warms the dried air back up.
- Hold temperature
Supply air leaves at your setpoint, so lights-off dehumidification doesn’t chill the canopy, and there’s no electric strip reheat.
Manufacturer data
UCHA-18TDC specifications
| Nominal capacity | 1.5 ton |
|---|---|
| Cooling capacity | 18,000 Btu/h (9,000–20,000) |
| EER2 / SEER2 | 11.96 / 19.30 Btu·h/W·h |
| Cooling @ 5°F | 18,766 Btu/h · EER2 28.6 |
| Heating capacity | 18,000 Btu/h (15,000–22,000) |
| COP / HSPF2 | 2.93 · 11 / 8.7 |
| Heating @ 5°F | 13,306 Btu/h · COP 2.70 |
| Electric aux heat | 0.85 kW |
| Dehumidification — cooling mode | 139.9 pints/day (DB 80.6°F, RH 60%) |
| Dehumidification — constant temp | 192.7 pints/day (DB 80.6°F, RH 80%) |
| Humidification | 101.3 pints/day |
| Indoor airflow | 530 / 440 / 365 CFM |
| External static pressure | Rated 0 · range 0–0.12 in W.C. |
| Indoor unit | 44.3″ × 10.6″ × 22.8″ · 28–43 dB(A) |
| Outdoor unit | 33.3″ × 23.8″ × 11.2″ · ≤52 dB(A) |
| Refrigerant piping | 1/4 – 3/8 – 1/2″ (liquid/gas/reheat) |
| Refrigerant | R454B |
| Throttle | EEV ×2 indoor · EEV ×1 outdoor |
| Operating range | Indoor 50–88°F · Ambient 5–118°F |
| Humidity setting | 30–90% RH |
| Power supply | 208–277V · 1Ph · 50/60Hz |
| Power input | 1,505 W (350–2,500) |
| Rated current | 6.5 A (1.66–11.84) |
| Heating input | 1,800 W (320–2,600) · 7.8 A |
| HSPF2 IV / V | 11.00 / 8.70 Btu·h/W·h |
| Indoor fan motor | DC |
| Outdoor fan motor | DC |
| Compressor | Rotary |
| Drain connection | 1/2″ external thread · drain pump standard |
| Max. allowable pressure | 609 psi |
Specifications are from the manufacturer datasheet and may change without notice. The unit rating plate governs.
Questions
UCHA-18TDC FAQ
How much water does the UCHA-18TDC remove?
About 140 pints per day (5.83 pints/hour) in cooling mode at 80.6°F and 60% RH. In constant-temperature dehumidification mode it removes about 193 pints per day at 80.6°F and 80% RH.
What power does the UCHA-18TDC need?
Single-phase 208–277V, 50/60 Hz. Rated cooling input is 1,505 W at 6.5 A.
Can it add humidity as well as remove it?
Yes. The 18TDC has built-in humidification rated at 4.22 pints per hour, so it can hold a humidity setpoint from either direction.
Does it work in cold climates?
Yes. It heats at 13,306 Btu/h with a COP of 2.70 at 5°F outdoors, and runs in ambient temperatures from 5°F to 118°F.
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