Has anybody had any dealings with marveleng/surf gas and their internal balanced flue gas hot water heater. It's a converted a bosch hydro 10 that's small enough to fit under a kitchen benchtop.

My old house had an internal rinnai 20 with balanced flue to outside but they don't make them any more - only the rinnai 26 - which is overkill for a 1 person unit. Any suggestions? It's a 1st floor unit with a 50litre electric hot water under the bench


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