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Installing water heater

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Hello, 

I intend to buy a water heater  and install it in one of my bahtrooms

first, do you have a brand to recommend ? I see prices on Lazada, and there are many in range 2800 -3000 bahts; inexpensive but are they good ? 

I have read that water heater can be dangerous ( electrocution ) , so I shall ask a Thai man who worked for me already and who seems to be a good professional electrician to install it for me 

are there any special precautions to take ? last year, this electrician installed a new Schneider electric meter following the advices I received on this forum ( I don't rembember the technical name, but it was from the recommandations of Crossy ) 

thanks 

 

 

 

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Posted (edited)

You have answered your own question, a quality unit (with earth leakage ELCB/RCD protection) correctly installed by a professional electrician. Maybe an outlet like homepro where they sell known brands

Edited by Peterw42
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Have a look online at powerbuy, good choice there and prices. I like Japanese products as very reliable, all are in the similar price range. Usually 3500 watt or 4500 watt on offer, 3500 watt seems perfectly fine in Thailand

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If you stay within 4.5kW, using a separate circuit from your CU (if possible - but in any case) run 2.5mm wires minimum for L,N,E.

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I would  recommend a unit with a copper heating tank  and as few internal circuit boards as possible.

This one Joven 2000   lasted many years until the water flow sensor sprang a leak..no spare parts too old !!!

IMG_20160618_085915_1.thumb.jpg.dd186be19be752daaab57c489bdb905a.jpg

 

I bought 2 cheapo  "Haier"   all singing and dancing heaters with 2 circuit boards inside  they both failed within a few months   but  where fixed under warranty.

 

 

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Have had any types over the years and like the current Panasonic models very much - cheap/safe/very good water flow and easy to install and use.

Be very sure ground is attached.  And best to have upstream RCCD as well as the built in unit to provide protection for fault to line into the unit (the Panasonic model is well protected by plastic but some others are not).  As said use 2.5 wire.  3500 should be fine for Bangkok/south but in upcountry mountains 4500 might be better - normally you can slow water flow to make hotter on coldest days.

image.jpeg.1af52cd203d7f7fe890c9a335910532c.jpeg

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There's now a Homepro Expo going on in Muang Thong Thani (Nonthaburi province, near Bangkok.) . 
If you do live not far from there, it's worth the visit and you can see the brands they offers (and inside the heaters).

They offers the heater with promotional prices.

 

http://www.impact.co.th/index.php/visitor/event_detail/en/36902/homepro-expo-ldquo-happy-home-healthy-living-rdquo

Now till august 2nd.

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On 7/30/2020 at 10:57 AM, lopburi3 said:

Have had any types over the years and like the current Panasonic models very much - cheap/safe/very good water flow and easy to install and use.

Be very sure ground is attached.  And best to have upstream RCCD as well as the built in unit to provide protection for fault to line into the unit (the Panasonic model is well protected by plastic but some others are not).  As said use 2.5 wire.  3500 should be fine for Bangkok/south but in upcountry mountains 4500 might be better - normally you can slow water flow to make hotter on coldest days.

image.jpeg.1af52cd203d7f7fe890c9a335910532c.jpeg

That is the one I bought. The 3500w Very reliable, and well designed to keep water out.  Can run it on a 20 amp circuit and 3 x 2.5 wire (if you can find 3 wire, lol.).   Bought mine on Lazada for about 2300.

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8 minutes ago, moontang said:

That is the one I bought. The 3500w Very reliable, and well designed to keep water out.  Can run it on a 20 amp circuit and 3 x 2.5 wire (if you can find 3 wire, lol.).   Bought mine on Lazada for about 2300.

It will only need a 16A breaker and the cable only needs to be 2.5 x 2 & 1.5 earth.

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3 hours ago, sometimewoodworker said:

It will only need a 16A breaker and the cable only needs to be 2.5 x 2 & 1.5 earth.

Most electrical codes require the ampacity of continuos loads to be increased by 25%.  3500÷240x1.25=18.xx.  I am not an electrician, but neither are the people working on electrical appliances, here.  Would be glad to look at someone else's calculation method.

 

The guy from Siam TV that had to redo my install six years ago on a 4500w, did give me a good tip, and that was to turn it off with the water running, and cool it down for 5 seconds or so...not as necessary on the 3500, but I still do it.  It prevents a sizzling effect if it is going to be used before it would normally cool off.  He also used the instruction booklet guide on how to precisely cut and strip the wires, which I did two years ago on the Panasonic, and it fit almost as good as OJ's glove.  The problem with the Siam TV install (free) was he stripped the jacket off the wire to slightly before it entered the unit, and did not install the rubber ring, leaving 2-3 mm of daylight around the wire.  And that was an Electrolux that wasn't nearly as well designed with safety features.

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28 minutes ago, moontang said:

I am not an electrician, but neither are the people working on electrical appliances, here.

Really??? Your knowledge is from?
 

The 16A breaker will happily allow a current draw well over it’s rating for longer (unless you are a teenage girl 😉 ) than any user is likely to shower, and the shower temperature it unlikely to be set to it’s maximum for most of the year. So with all of that a 16A breaker is easily big enough.

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Posted (edited)
4 minutes ago, sometimewoodworker said:

Really??? Your knowledge is from?
 

The 16A breaker will happily allow a current draw well over it’s rating for longer (unless you are a teenage girl 😉 ) than any user is likely to shower, and the shower temperature it unlikely to be set to it’s maximum for most of the year. So with all of that a 16A breaker is easily big enough.

But not code compliant.  "Likely," "unlikely"...yeah, right.

Edited by moontang

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1 minute ago, moontang said:

But not code compliant.  

55555555555555555

you are sure?

 

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anyone know why a water heater would take longer to heat the water than usual? my previous 3500 watt heater did it pretty quick, this one pretty slowly, both Japanese and 5+ years old so I'd expect still to be good

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Posted (edited)

Cooler water in and /or higher pressure/flow rate assuming both heater are the same wattage.

Edited by johng

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