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SpecSenville Leto 12,000 BTU 230VDella Serena 12,000 BTU 115V
PhotoSenville Leto 12,000 BTU 230VDella Serena 12,000 BTU 115V
Our scoreSCORE6.4 / 10SCORE7.3 / 10
Our takeThe Leto 12k to look for if your panel allows: 8,000 BTU/h at 5°F on a 15 A max fuse. We don't have a verified listing for this version.The most 5°F heat of the 115V 12k units we cover, 9,200 BTU/h, with ENERGY STAR Cold Climate status. You still need a vacuum pump or a tech for the startup.
Nominal size12,000 BTU12,000 BTU
Voltage230V115V
Rated heat at 47°F12,000 BTU/h12,300 BTU/h
Heat at 17°F9,300 BTU/h9,500 BTU/hbest
Heat at 5°F8,000 BTU/h9,200 BTU/hbest
Lowest heating temp5°F5°F
SEER221.322best
HSPF2 (Region IV)9.19.5best
Install typeFlareFlare
Line set in boxn/a16.4 ft
Max line run82 ftbest65.6 ft
Warranty covers owner installNoConditional
Warranty, parts5 yrn/a
Warranty, compressor5 yrn/a
ENERGY STAR Cold ClimateNoYes
ENERGY STARNoYes
RefrigerantR-454BR-32
Watch out forAmazon Leto listings don't state refrigerant; current R-454B pairings are SENL-xxCD-OL + SENL-xxCD-ILL, older R-410A ones end /OY + /IY. Senville's FAQ says no to owner installs, and the warranty requires a licensed HVAC contractor.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.
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