I will follow up on brianmoore's helpful post.
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Discuss 7kw electric shower - 4mm2 too risky? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
Brilliant thanks for all the detailed information.Rules to Follow to Avoid Pump Problems | Valin - https://www.valin.com/resources/blog/rules-follow-avoid-pump-problems
The pump should be located close to where it draws suction from the cold water tank to ensure the minimum Net Positive Suction Head Available NPSHA of 2m h2o Is exceeded. If a long thin pipe run provides the water feed to the pump inlet there is the risk of the NPSHA dropping below 2m because of friction in the pipe, its bends and joints and turbulence acting to reduce head of water pressure.
The cold water tank also provides a large reservoir of water to provide a short term high flow rate to the shower which is why I do not recommend connecting the pump to your mains water pipe directly. At a high flow rate the water pressure in the mains pipe coming into your home will decrease and thus could fall below minimum inlet head of water of the pump.
Note also that you should avoid sharp bends near the inlet and outlet of the pump. Have long arcs of pipe work so the water flow is not overly disturbed.
I just wondered where you have reached with this shower project?
Reply to 7kw electric shower - 4mm2 too risky? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net