I don't use hot water heater parts, just regular water heater parts. I've never needed to heat hot water. :fro:
If using 110v you can build a 3,300 watt kettle for less than $70.00
$30.00 (2) 1,650 low density elements
$20.00 (2) Appliance cords
$5.00 (2) 1" PVC threaded couplings and threaded caps
$10.00 Stainless washers and Silicone O-rings
Or a 220v for cheaper
$20.00 5000w element
$10.00 Range cord
$10.00 Metal WP box and covers
$5.00 Stainless washers and Silicone O-rings