Boler water setup help

[Johnny M]

Okay guys, I need some help with my new water setup for our Boler

For the shower, I am installing a 16 gallon water tank, I plan to have a gravity water fill and a city water hookup. The shower will be a large utility sink without the legs to serve as a multi-purpose sink/mini shower/mini tub for our 2 year old.

Now, for hot water for showers we will be using an instant hot water heater like this:

Water Heater 6L Gas LPG Propane Tankless Boiler Instant Household Water Heater | eBay


Along with this water pump:

New RV Marine DC 12V 4 3L MIN 35 PSI Fresh Water Diaphragm Self Priming Pump | eBay

Now can anybody tell me if there is any reason this water pump would not work with this water heater or vise versa?