Instantaneous Water Heaters

[Grant]

Looking for a bit of advice on these things.

not sure how many are needed

downstairs:
kitchen, laundry, scullery, guest bathroom (shower + basin).

outside:
separate guest accom (housekeeper's room) shower, basin, kitchen sink.

upstairs:
en-suite bathroom 1: bath, shower, basin
en-suite bathroom 2: shower, basin
bathroom 3: bath, shower, basin

home only has 2 occupants, so no constant high volume of hot water is required.

i'm thinking 2 heaters for upstairs area.
1 heater for downstairs
1 heater for housekeeper

4 of these perhaps: (house has 3phase power)

PlumbIt

plumbitonline.co.za

 

[wingnut771]

Looking for a bit of advice on these things.

not sure how many are needed

downstairs:
kitchen, laundry, scullery, guest bathroom (shower + basin).

outside:
separate guest accom (housekeeper's room) shower, basin, kitchen sink.

upstairs:
en-suite bathroom 1: bath, shower, basin
en-suite bathroom 2: shower, basin
bathroom 3: bath, shower, basin

home only has 2 occupants, so no constant high volume of hot water is required.

i'm thinking 2 heaters for upstairs area.
1 heater for downstairs
1 heater for housekeeper

4 of these perhaps: (house has 3phase power)
View attachment 1831262

PlumbIt

plumbitonline.co.za

Don’t instant hot water geysers use around 6kW?

 

[Grant]

Don’t instant hot water geysers use around 6kW?

i know precious little about them.
i'm under the impression they are fairly good in terms of electricity consumption as they are not constantly having to maintain 200L of water at 55degrees, 24 hrs a day - every day, every week.

i may be wrong on that

 

[gotaway]

Instantaneous draw is very high, but overall consumption should be low. Might not be ideal if the house is run on solar?

 

[wingnut771]

i know precious little about them.
i'm under the impression they are fairly good in terms of electricity consumption as they are not constantly having to maintain 200L of water at 55degrees, 24 hrs a day - every day, every week.

i may be wrong on that

Agree they are as they are at the source so you don't have to wait for the hotwater from a geyser miles away.

 

[wingnut771]

Instantaneous draw is very high, but overall consumption should be low. Might not be ideal if the house is run on solar?

Not a problem when you have 12kW inverter and 30kWh battery, just dont run 2 at a time. Then again, when you have free solar, who cares if you wasting when you wait for the hotwater to run through the pipes from the geyser.

 

[Lupus]

i know precious little about them.
i'm under the impression they are fairly good in terms of electricity consumption as they are not constantly having to maintain 200L of water at 55degrees, 24 hrs a day - every day, every week.

i may be wrong on that

Neither does a correctly installed geyser, it will turn on after water is drawn to warm the incoming water, once the water is warmed it'll draw every once in awhile to maintain that temperature which can be every 6 hours or so.
If your geyser is running 24 hours a day, you're using a lot of hot water, it's leaking or the thermostat is gone.

 

[Lupus]

Agree they are as they are at the source so you don't have to wait for the hotwater from a geyser miles away.

I think you've got an issue if the geyser is miles away, generally people have them reasonably close

 

[Lupus]

Not a problem when you have 12kW inverter and 30kWh battery, just dont run 2 at a time. Then again, when you have free solar, who cares if you wasting when you wait for the hotwater to run through the pipes from the geyser.

I was considering getting another battery to give me that, but I would need additional panels to ensure it remains charged.
Remember for every battery you add, you need a way to recover that charge.

 

[wingnut771]

I think you've got an issue if the geyser is miles away, generally people have them reasonably close

The house is triple story so the water takes time to get to the kitchen sink.

 

[wingnut771]

I was considering getting another battery to give me that, but I would need additional panels to ensure it remains charged.
Remember for every battery you add, you need a way to recover that charge.

Sure, you have 10kWp system on the roof.

 

[Lupus]

The house is triple story so the water takes time to get to the kitchen sink.

Okay something weird is happening my posts are changing by themselves

 

[Lupus]

Sure, you have 10kWp system on the roof.

Currently no, but it might happen, I've got the inverter and the batteries, need a new cabinet for the new batteries and of course new panels.

 

[wingnut771]

Currently no, but it might happen, I've got the inverter and the batteries, need a new cabinet for the new batteries and of course new panels.

Take the money for the cabinet and buy more panels.

 

[Lupus]

Take the money for the cabinet and buy more panels.

Cabinet is needed, panels are a consideration. But back on topic instant hot water is great for at your kitchen taps, but at a shower hmm.
My brother had one in his flat in London, it sucked.

 

[wingnut771]

Cabinet is needed, panels are a consideration. But back on topic instant hot water is great for at your kitchen taps, but at a shower hmm.
My brother had one in his flat in London, it sucked.

What sucked about it? Was it electric?

 

[IamNoone]

I had a shower attachment that connected to the power from the light which heated the water as it flows through. Unfortunately if the water pressure was too high, the water did not get a chance to heat up properly. Utterly useless in winter.

 

[wingnut771]

I had a shower attachment that connected to the power from the light which heated the water as it flows through. Unfortunately if the water pressure was too high, the water did not get a chance to heat up properly. Utterly useless in winter.

How many kW?

 

[Sinbad]

Get gas.
You need bags of heating power if you want a decent flow rate. Electricity doesn't cut it.

 

[wingnut771]

Get gas.
You need bags of heating power if you want a decent flow rate. Electricity doesn't cut it.

There will be no gas when WW3 starts.