Head-to-head · Best Mosquito Traps

Flowtron BK-15D Electronic Insect Killer vs Thermacell E90 Rechargeable Mosquito Repeller

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Thermacell E90 Rechargeable Mosquito Repeller comes out ahead by a clear margin (4.2 vs 4.6). The gap is mostly about Sitting on a patio or deck tonight with no setup time and no breeding-cycle wait — read the strengths below before deciding.

Ranked #4 in Best Mosquito Traps

Flowtron BK-15D Electronic Insect Killer

4.2

$60

The Flowtron BK-15D is the volume-leader in the budget bug zapper class and the cheapest 'real' attractant trap in this lineup, with a 5,600-volt grid, included octenol cartridge, and a 2-year warranty. The honest case against it is the same case against every UV bug zapper: independent entomology research has repeatedly shown that under 10% of the catch is actually biting insects. The other 90%+ is moths, beetles, and beneficial pollinators. If you want a $60 noisemaker for a barn or workshop, it earns its keep. If your goal is mosquito reduction specifically, the DT2000XLPSR is the smarter $99.

Strengths

— 5,600-volt non-clogging grid is the strongest in the budget zapper class
— Half-acre coverage with included 100-hour octenol attractant cartridge for the first season
— Built-in 2-year warranty (longer than DynaTrap, Katchy, or any Thermacell)

Watch-outs

— University of Notre Dame and Delaware research found only 4.1-6.4% of zapper catches are actually mosquitoes the rest are beneficial moths, beetles, and parasitoid wasps
— Audible snap with every kill, which is the entire opposite of 'quiet patio operation'
— UV bulb commonly fails before the 1-year mark and replacement bulbs run ~$20

$60 · Check Price on Amazon Full review →

Higher ratedRanked #2 in Best Mosquito Traps

Thermacell E90 Rechargeable Mosquito Repeller

4.6

$50

The Thermacell E90 is the only product in this lineup Wirecutter has called 'actually effective' in long-form testing, and it dominates the 'mosquito control for patios' SERP for a reason. Instead of trapping or killing, it warms a metofluthrin-treated puck that creates a 20-foot vapor zone that mosquitoes will not fly through. A 9-hour rechargeable battery covers full evenings, and the refill economics are friendlier than they look. The catch is that it does nothing about your population problem it is personal protection, not a control program, and a 5 mph breeze can hollow out the zone.

Strengths

— 9-hour rechargeable lithium-ion battery covers most patio evenings on a single charge
— 20-foot protection zone establishes in 5-15 minutes with no flame, no spray, and no scent
— Wirecutter's 2024 top pick for outdoor mosquito repellers, called 'effective' rather than 'better than nothing'

Watch-outs

— Repellent zone collapses in wind above ~5 mph, per multiple reviewer reports
— Does not kill mosquitoes or reduce the breeding population it just pushes them out of the protected zone
— Refill puck must be replaced every 12 hours of use, adding ongoing cost

$50 · Check Price on Amazon Full review →

How they stack up

Flowtron BK-15D Electronic Insect Killer

The cheapest real attractant trap in the lineup and the only one with an audible electric grid the DynaTrap DT2000XLPSR and Mosquito Magnet Patriot Plus both kill silently. Has the worst pollinator-impact profile here, with independent research showing under 10% of the catch is mosquitoes versus the more selective Mosquito Magnet. The Katchy is similarly UV-attractant-based but indoor-only and zap-free.

Thermacell E90 Rechargeable Mosquito Repeller

Unlike the DynaTrap DT2000XLPSR or Mosquito Magnet Patriot Plus, the E90 does not reduce the mosquito population it just pushes them out of a 20-foot vapor zone. That makes it the immediate-relief complement to the DynaTrap's slow population control, and the only pick here a Wirecutter-acknowledged 'best mosquito control' authority calls effective for actual evenings outside. Far quieter than the Flowtron BK-15D and far more pollinator-safe than any UV zapper, including the Katchy.

Specs side-by-side

Spec	Flowtron BK-15D Electronic Insect Killer	Thermacell E90 Rechargeable Mosquito Repeller
Coverage Area	1/2 acre	20-foot protection zone (~315 sq ft)
Trap Type	15W UV bulb + octenol attractant + 5,600V electric grid	Heat-activated metofluthrin vapor zone (repeller, not trap)
Power Source	AC corded	Rechargeable lithium-ion battery
Bulb Type	15W BF-35 UV replacement bulb	—
Grid Voltage	5,600V (vs ~4,200V competitor standard)	—
Attractant Refill Required	Octenol attractant strip every 30 days (~$8)	12-hour metofluthrin puck (~$5, ~$1.50/night)
Weight	4.1 lbs	1.0 lb
Dimensions	8.5" L x 8.5" W x 11.8" H	—
Warranty	2-year limited	1-year limited
Battery Life	—	9 hours per charge
Charge Time	—	~9 hours via USB-C

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