DUNROAMIN Posted December 8, 2019 Share Posted December 8, 2019 Hi to all, any electricians out there? I have and existing tankless 4500W hot water system in the shower, I would like to know if I upgrade to a 6500W system, what size cable and breaker do I need to supply power to the 6500W system? The current 4500W shower has 2.5 mm cable with a 16 amp breaker. I was thinking maybe 4 mm wiring and 20 amp breaker, not sure? Any info would be appreciated, cheers. Link to comment Share on other sites More sharing options...
Crossy Posted December 8, 2019 Share Posted December 8, 2019 Your 6500W heater is going to pull around 30A so a minimum of 4mm2 cable and a 32A breaker. Personally, if I was going to have to pull a new cable I'd stick in 6mm2 with a 40A breaker and have done with it. Next stop, 8kW heater! Link to comment Share on other sites More sharing options...
lopburi3 Posted December 8, 2019 Share Posted December 8, 2019 36 minutes ago, Crossy said: Next stop, 8kW heater! It is only a few days a year (at least normally - last two years almost none but we may pay the price this year) and with a good heater you can lower the water flow enough to be comfortable (in Bangkok) with the normal 3.5k units (although you may want to turn off the bathroom fan until after the shower). For good T shirts highly recommend this firm - very good price and quality and fast shipment. Not wife beater weather. https://shopee.co.th/product/36428537/527434789 Link to comment Share on other sites More sharing options...
sfokevin Posted December 8, 2019 Share Posted December 8, 2019 I replace the master bath shower heater with this... Installed it in the attic just above the shower (Was also thinking of just putting it on the wall just outside the shower but thought it would not look nice)... In the attic works great as is is usually hot up there... The unit only draws 2,000 watts with a regular plug so no special wiring needed... https://www.homepro.co.th/p/1016377 Here is a selection https://www.homepro.co.th/c/PLU0502 Link to comment Share on other sites More sharing options...
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