Since 1978, Girish has designed and manufactured more than 250 standard and 10,000 custom built heaters. The expertise at Girish Heat allows it to make long lasting, high quality heaters to suit customer requirements. Water immersion heaters: Girish Electrical Industries manufactures ‘Girish Heat’ brand ISI & CE marked industrial water immersion heaters. These heaters are made of two or more copper-sheathed tubular heating elements brazed to brass flange. Heaters are nickel-chrome plated and provided with earthing terminals. A metallic cap is provided for protection of terminals.