Multi-zone sizing needs a load calculation
19,000 BTU is sized across zones. Each zone needs its own load calculation.
ACCA Manual J ↗
19,000 BTU heat pumpMRCOOL 19,000 BTU Multi-ZoneMULTI3-18HP230C-O
AHRI reference 217291692
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Where to buy
Check model number MULTI3-18HP230C-O at your preferred retailer.
Same housing as MULTI6-48HP230C-O; small details may differ.
Decision guide
At a glance
What the published numbers mean before you compare every spec.
Cold-weather output
At 5°F, certified output is 13,500 BTU/h — 71% of its 47°F rating.
ENERGY STAR ↗DIY status not confirmed
The cited fields do not confirm a pre-charged line set or DIY-line designation for this model.
Electrical service
208/230V equipment; confirm the dedicated circuit and disconnect requirements with an electrician.
Manufacturer spec ↗Heating efficiency in its size class
HSPF2 9.8 is below the 10.2 average among 125 models in the same rounded capacity class.
ENERGY STAR ↗Good fit if…
A room-by-room load calculation supports this outdoor system across the planned zones.
Think twice if…
You have not calculated each zone’s load or accounted for 208/230V equipment.
Multi-zone systems need room-by-room load calculations and zone planning; use Manual J for final sizing.
Certified spec table
| Outdoor model number | MULTI3-18HP230C-O |
|---|---|
| AHRI reference number | 217291692 |
| Series | MULTI |
| Heating capacity at 47F | 19,000 BTU/h |
| Heating capacity at 17F | 16,000 BTU/h |
| Heating capacity at 5F | 13,500 BTU/h |
| SEER2 | 25.1 |
| EER2 | 14 |
| HSPF2 | 9.8 |
| Voltage | 208/230V |
| Minimum circuit ampacity | 16 A |
| Maximum breaker / fuse | 20 A |
Values marked ENERGY STAR come from the certification dataset; values marked Manufacturer spec come from the linked product documents.
Other certified configurations of this outdoor unit
MRCOOL MULTI3-18HP230C-O appears in the certification records under 3 separate certificate numbers. The equipment is the same; the tested pairing and the resulting ratings differ. This page carries them all.
| AHRI reference | Indoor unit | Heating at 47°F | Heating at 5°F | SEER2 | HSPF2 |
|---|---|---|---|---|---|
| 217291692 | Not supplied | 19,000 BTU/h | 13,500 BTU/h | 25.1 | 9.8 |
| 217291693 | Not supplied | 19,000 BTU/h | 14,600 BTU/h | 20 | 10 |
| 217291694 | Not supplied | 19,000 BTU/h | 14,000 BTU/h | 22.55 | 9.9 |
Every row comes from the same certification record set, retrieved 2026-08-09. Ask the seller which certificate number the unit you are quoted matches.
Specs not published for this model
The sources we cite do not publish these values for this model, so we leave them blank rather than guess.
Indoor model numberLine set length rangePre-charged line setBrand DIY line
Check the fit for your room
Room-size guidance is a starting point, not a load calculation. Confirm sizing and installation requirements with a qualified contractor.
Check your room size