Outdoor rainwater shower: Which pump?

[ana_conda77]

I am hoping that this pump will work for an outdoor rain water shower that I am currently setting up outside on our balcony. I contacted the company to ask for advise on this but they haven't responded. If this won't work do any of you know if there is another pump that will work?

Garden Pump TGP 1000 E - https://www.trotec24.com/en-de/tools/submerged-water-pumps/garden-pump-tgp-1000-e.html

I plan on trying to pump the rain water from a barrel on the ground floor of my home up to a gas powered shower on our balcony (first floor at approx. 3m to 4m high). See attached pictures

This is the shower we have purchased and all the spec is listed on here.

12L Gas LPG Hot Water Heater Propane Tankless Instant Boiler Shower Ridgeyard | eBay - https://www.ebay.ie/itm/12L-Gas-LPG-Hot-Water-Heater-Propane-Tankless-Instant-Boiler-Shower-Ridgeyard/223063002343?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Suitable Water Pressure.....Min.0.02MPa.Max.0.8MPa, Starting Pressure: 0.025MPa

What pump would work in this type of setting?

Many thanks

Anna