That innovation portable shower is exactly what I was talking about. Also, this will be a temporary setup, maybe should have mentioned that. Plus I'll be taking Marine showers. This is the heating element I was talking about..

https://www.amazon.com/dp/B08VF38H25/ref=cm_sw_r_cp_apa_fabc_0B4HAVJ80MJZ8X9DTMHV?_encoding=UTF8&psc=1

I don't plan on keeping the water pump running the whole shower

Thanks!