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Just working out the plumbing for the 30 m2 garden room (GR). Small sink, washbasin and shower. To keep it simple I think an instantaneous water heater should be OK for the job. Reading here ( @JSHarris ) and elsewhere the Stiebel Eltron DHC-12E looks like a good bet (£202 on Amazon). There are a couple of issues firstly the unit will be 45M, run, from the Electric meter, 16mm buried in ground comes out OK and because the unit derates a bit, assuming I have read the blurb correctly, through voltage drop I will have a few amps to play with on the 63A consumer unit for lighting in the GR when the unit is running. The second complication is that we, note the use of the word we, would like the Stielbel unit in the cupboard under the sink, I cannot see a problem with this as the brochure shows a unit, or very similar, under a work surface and hopefully most of the heat goes into the water and so it won't warm up the cupboard too much. The big question is can the Stielbel unit feed a thermal mixer shower tap, many of the cheaper units say they must not be connected to such devices but I can find no mention for this unit, or should I just set the temperature output of the Stiebel unit to shower temp and run it straight or use a manual mixer?
