Rinnai hot water bottleneck

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I've been asked to run 40m of gas pipe to a Rinnai 32 litre instantaneous at low pressure (1.1kpa). The problem I see though is that the plumber has run 1/2" pipe from the unit for the hot water. It does have a 3/4" cold inlet. I'm just wondering if it's likely to ever get 32 litres per minute flowing with just a 1/2" outlet. Any thoughts?


Read the full thread at RenovateForum.com... (http://www.renovateforum.com/f78/rinnai-hot-water-bottleneck-78310/)