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hot-cold-hot-cold


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Down at the site today and under the slab in the void the hot and cold water pipes are running tight together with hot and cold alternating.  So cold-hot-cold-hot-cold.  Which is the order they come from the sink/shower/wc above.

They are mlcp insulated pipes so the rate of heat loss is reduced but I asked the plumber to reroute them to be hot-hot-cold-cold-cold to reduce the heat loss.  Of course the plumber said with insulated pipes it makes no difference.

 

The run is across about 7 metres.  The insulation on the pipes is only about 6mm.  I like my hot water hot and my cold water cold and as I see it the hot and cold pipes will ultimately transfer heat between each other and it would be good to minimise that.

Does the order of the pipes matter or is the plumber right about the insulation making the order of the laying of the pipes irrelevant.  Am I being too pernickity here? 

 

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