Question about power...

[spreerider]

with your demand of 1440W you will be fine but are slightly pushing it and in even a small fault like a pump getting jammed it will draw larger than its highest current and could cause nusance trips,
a single duplex recepticle is both plugins they are usually on one circuit but in kitchens each plug on the duplex recepticle should be on a different circuit so you can plug the toaster 1400W and the kettle 1500W at the same time and not trip the breaker,
If you are worried contact a local electrician and have them quote a new run from the panel to your tank and install a GFCI for both circuits it could save your life in the event of a fault.