insnrg was founded recently, and are an Australian company using locally-made, and imported parts. These heaters use fan-forced combustion, and hot-surface ignition. We have no data on heating efficiency (mJ in vs Heat Output).
Unfortunately we cannot recommend insnrg heaters.
Gi gas heaters come in three sizes: 150 (160mJ), 250 (265mJ), 400 (420mJ).