Tankless water heater

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I have one of these. Works well, but you want it as close as possible to the shower :)

That's what I am looking at Steve to replace my old carver that went up the creek first day on our 90 days trip last year, Now Rhona is home and getting better I have a bit of time to do some jobs on the van
I had a measure up and think I can get it in where the old carver is
 
Has anyone fitted one of the Whale Expanse underfloor water heaters? I keep thinking of removing the calorifier and fitting one but never got round to it
 
I fitted the underfloor version on my self build MWB Boxer a number of years ago. The choice was mainly on the basis of space. I don’t have a shower so couldn’t comment on its performance in this respect. When it comes to flow rates I would avoid 90 deg bend joints where it comes through the floor if at all possible. I think some have had problems with hard water and the drain valve leaking. Whale advised using some descaling powdered to avoid this. You do get some drips as the valve also acts as pressure release as the water heats up.
 
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