Point-of-use Water Heaters should be in Every Home.

This is how you electrify sinks. I am no longer considering any other option. This is the only solution you need.

0:00 - Intro
0:46 - Instant hot water
1:06 - Doesn't interfere with showers
3:13 - If it works for me, I guarantee it will work for you
5:11 - It works in practice, but does it work in theory?
7:08 - Water and energy savings
10:46 - The cherry on top
11:47 - Climate impact analysis
16:13 - Energy security
17:35 - Outro

[SizeMichael]

I don't plan to start remaking my old videos, but I thought this one to be particularly important (I was also particularly unhappy with the original)

I mention in the video that these products cost 18 euros at my local hardware store. They actually carry 3 variants, and this is the cheapest one, but also the most reliable and well-built (I've tried them all). They are sold under a million brands, so if you find one that is SHAPED like mine, it will almost certainly have a different brand on it, but they obviously come from the same factory. If it looks like mine, I recommend it.

[saschapapp]

I love the fact that we have a boiler - the heatpump is heating the water in the boiler up to 62°C during the day when we have excess power and we can shower/bathe all evening with the pre-heated water.
we would use MUCH more energy from the grid, if we had point-of-use heaters since we always shower/bathe late in the evening when the sun is long gone.

[geofffs]

Bit horrified, the electric socket is installed within the waterflow from the swivel tap. In what country is this legal?

[petterbirgersson]

In Sweden we often have district heating, so this system is not needed here. You should advocate for your city to install district heating and district cooling if you live in an are without that!

[rewindoflow]

I feel like a big unmentioned energy saving is just the wasted heat that goes in if you only want to run the hot tap for a short time (like washing hands, etc). The boiler doesn't just have to heat up the water that comes out but it has to heat the water all the way to the tap. Point of use you're only heating the water you actually need, not all the water in the pipework.

[copperknight]

Whilst it is an interesting concept, you can achieve similar results by using an undersink boiler and/or having a good regulator attached to your shower.

[riddickraymond]

Looks like you should get a dishwasher

[tobiaskosub]

Genereally like your videos on energy but this one is very .. ugh... presenting only a very odd perspective of the truth. Maybe it reflects your personal situation, but has no general implications whatsoever, in contrast to your other videos on Energy. So I had hoped you might mention this major caveat

1) if you live in an urban area, using a centralized hot mains water line is very nearly always preferable. cost and climate wise
2) if you have only cold water, then getting a heat pump + hot water storage is just always better than resistive heating. Heat pumps are so good, that even a gas fired heat pump (as opposed to conventional electric ones) would be better than this resistive water heater.

[richdobbs]

Doing this for an off-grid house sounds attractive to me. For something like 8 months of the year I will have a surplus of electrical energy and battery storage, while for 2 months I will probably have a severe shortage because of cloudy, cold weather. So, this should reduce propane usage during summer, spring and fall.

[gsilva]

Here in brazil, 95% of water heating is electric point-of-use and about 4% is gas point of use. The remaining percent is either solar, gas or electric with boilers.

[Validole]

Even without watching the video, as an electrical engineer this is a horrible thing from grid balancing and green transition perspective.

But sometimes becessary

[LedoCool]

I used such heaters (not exactly those, but I imagine those issues apply) and they are frankly unsafe and unstable. They struggle to keep water warm at set temperature if you change the flow, sometimes they struggle to even heat it up and one such device self-destroyed itself on me. I think they are also a primary suspect in electrocution.

[sillystupidusername]

There is a valve that almost all new systems use which prevents the temperature swings that you're talking about when other faucets get turned on. Look into it and switch over to them

[chrischen]

Hey there, the major downside you discribe on your combi-boiler is solved, in europe at least, by just putting a big ( some 1-8m³ or 35-280ft³ ) buffer storage for hot water in between the boiler and all the water outlets. (feasable for central heating systems at least)
This very nicely reduces the effect of multiple water outlets, influencing on each other, to zero.
This problem IS solved - since the the 1990s or even before...
Have a nice day. Greetings from Germany.

[JimiQ]

I have a heat pump for heating and hot water with 190liter tank. I also have circulation pump that runs every 40 minutes for 3 minutes.
Sadly it’s not providing hot water in the kitchen that’s furthest away, because I turned the pump down for winter as my COP for hot water was around 2.6. When it gets warmer I will turn it up (I have it at 3/8)
Also we have just orderer PV roof system that will offset most of the electricity usage.
Great video, thanks!

[ross]

UK combi boilers have no issue supplying multiple outlets/showers without temperature fluctuations. sounds like theres something wrong with your system.

[geirmyrvagnes]

So it is better than a horrible solution that I would never consider. That doesn't mean that they should be in every home.

[JorgeHSM]

in brazil point of use heating is the norm
there are few states where it gets cold enough to justify gsa heated showers so we have mostly electric shower or boilers

[CitarNosis]

Nah, they suck. Novel idea, clean and works great for like a few weeks or months but I really hate them long-term.
1) They clog up, get dirty, they are hard to clean.
2) Making them just the right temp is a huge chore. Usually just gets too hot so you alternate between cold and hot so you don't burn yourself.
3) All the ones I tried out had mechanical/electrical issues after 6-12 months.

You can keep them bro.

[DynamischeEnergieNL]

Boilers are Better because we should use the green energy when it’s available and this solution is nice but still increase the morning and evening peak.