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SpecDella Serena 18,000 BTU 230VSenville Aura 18,000 BTU 230V
PhotoDella Serena 18,000 BTU 230VSenville Aura 18,000 BTU 230V
Our scoreSCORE7.3 / 10SCORE7.5 / 10
Our takeOur pick for a garage or shop if you'll handle the evacuation: 13,500 BTU/h at 5°F and free parts for a registered DIY install. Nothing is published below 5°F.Full rated output at 5°F, matching the Olympus E Star 18k value for value, and it cost less than the Amazon Olympus when we checked. Licensed install required.
Nominal size18,000 BTU18,000 BTU
Voltage230V230V
Rated heat at 47°F18,000 BTU/h18,000 BTU/h
Heat at 17°F15,000 BTU/h18,000 BTU/hbest
Heat at 5°F13,500 BTU/h18,000 BTU/hbest
Lowest heating temp5°F-22°Fbest
Max heat at lowest tempn/a8,000 BTU/h
SEER222best21.4
HSPF2 (Region IV)9.511best
Install typeFlareFlare
Line set in box16.4 ftn/a
Max line run98.4 ft98.4 ft
Warranty covers owner installConditionalNo
Warranty, partsn/a5 yr
Warranty, compressorn/a10 yr
ENERGY STAR Cold ClimateYesYes
ENERGY STARYesYes
RefrigerantR-32R-454B
Watch out forDella's own 25 ft line set on Amazon is 1/4 x 3/8 in, which doesn't match the 18K's 1/2 in gas line. The listing says "Pre-Charged", but Della's FAQ says the lines are not pre-vacuumed; it is a flare-and-vacuum install. Della's printed manual says the extended warranty is for professional installation; the current web policy gives registered DIY installs replacement parts at Della's discretion. Screenshot it the day you buy. Della also sells Vario, Optima Pro, Hyper Heat and older R410A lines; most owner reports are about those.The Amazon 18k listing gives 2 yr parts / 7 yr compressor; confirm the term for the model you receive. The Amazon Aura listings don't state refrigerant. The 12k listing (SENA-12HF-16) shows a 25.5 efficiency figure that matches the older R-410A Aura and a 2 yr parts / 7 yr compressor warranty field; confirm model and refrigerant before you pay. Current R-454B wall pairings are SENA-xxHF-OG + SENA-xxHF-IGG; older R-410A pairings end /OQ + /IQ. Senville's site lists higher HSPF2 and 47°F heat than the AHRI figures on NEEP; we use the certified numbers. Senville's FAQ says no to owner installs, and the warranty requires a licensed HVAC contractor.
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