BACKGROUND: Pulsed field ablation (PFA) induces cell death predominantly through irreversible electroporation (IRE), a non-thermal mechanism. However, Joule heating during PFA delivery may result in clinically relevant temperature rises. OBJECTIVES: This study aimed to characterize the thermal profiles, peak surface temperatures, and ablation lesions produced by 6 proprietary PFA catheters using an ex vivo vegetal model. METHODS: The thermal profile of 6 PFA catheters-Farawave, PulseSelect, Volt, Varipulse, Electropulse, and Sphere-9-was evaluated in Solanum Tuberosum at recommended energy settings. Thermal imaging was performed using a high-resolution infrared camera. Standard PFA applications were delivered in 5 independent runs for each catheter. Post-ablation, specimens were stained with 0.5% triphenyl tetrazolium chloride (TTC) to delineate IRE and reversible electroporation (RE). RESULTS: All systems demonstrated reproducible and distinct thermal signatures. Mean peak temperature rises were as follows: Varipulse low irrigation flow (4 mL/minute), 15.1°C ± 1°C; Farawave basket, 13.6°C ± 0.6°C; Farawave flower, 9.7°C ±0.4°C; Varipulse high irrigation flow (30 mL/minute), 8.5°C±0.5°C; PulseSelect, 4.1°C ± 0.6°C; Electropulse, 2.7°C ±0.7°C; Sphere-9, 2.1°C ±1.2°C; and Volt, 1.3°C ± 0.2°C (Kruskal-Wallis, P < .0001). PFA catheters demonstrated either localized or distributed thermal hotspot patterns. Localized hotspot catheters confined heating within 1 mm of the electrode margin, whereas distributed hotspot catheters exhibited additional peripheral hotspots beyond 5 mm, as observed with the Farawave catheter. All catheters produced well-demarcated TTC-unstained IRE lesions surrounded by a rim of TTC-stained RE tissue. CONCLUSION: PFA systems exhibit distinct thermal signatures and can be categorized as low (0°C-6°C), moderate (6°C-12°C), or high (12°C-18°C°C) heating profile catheters.