You need to read more about solar heater. What size is sufficient. And the important thing is "worst weather scenario". Not in good weather scenario.

So what is the highest temperature can the heater generate during the raining day? The highest the water temperature, the less hot water ratio you need to mix. That give you more people can use perliter of hot water. It is about the efficiency the heater.

Ya I know they will tell you, just switch ON the heater when raining day. Than what the use I buy a solar heater if the most colder day I cannot get the hot water. What is that solar mean. Does it tell me the efficiency is low of that brand/model.

Have you check how many liter of water you need to use for bath? The checking is just as simple as using the baldi to measure. Than x how many person. The ratio of hot water. Don't forget the extra liter and the temperature of the hot water for some safe calculation.

With some own checking and data collect, I believe you can decide what brand/type of solar heater is good for you. You need to ask for the data spec from the brand that you search. Not just reading at the company conflict and their operation.

Don't tell me you change job already.

Maybe people here like to take hot shower no matter what weather. Like my colleague kid. Everyday hot shower even very hot weather.

Last 2week visit my retired sifu in Japan. He retired into the deep high mountain. Built his own house. He get the hot water from the "onsen". Underground hot water nearby. Plenty and free whole yrs.

Like this can consider wor. As a reseller with some commission. Go, go, go.

Same theory but different way of working.

For the poly pipe, you need something call straight join fitting. Buy it from hardware shop, measure how much need to cut the pipe. Than joint with that fitting.

For the copper pipe, also same. Get the copper straight joint. You have a choice of using ring screw lock type or solder type. Ring screw lock is easy to joint. But bigger size and carefull to conceal for leaking. Solder need burner to solder. But smaller size and won't easy leak.

If your condo have a roof.

Later his whole balcony drop down.

The haze block the sunlight for whole day and many day.

Or wrong efficiency heat absorption calculation ?

When you buy such a water heater or aircon, there is a spec you can check. The differential temperature efficiency.

Where for a solar heater, how many degree of temperature from the ambient outside can be bring up the water temperature. This is the efficiency you need to know before get a solar heater.

Another example to ask is, can I install your solar heater on the mount kinabalu ? Don't tell me I have to switch on the heater.

I always have this idea of how to store more hot water using smaller size solar heater. Will this cost less instead of get a bigger size heater. I have some roughly idea which I think can run. Just need to put it on practical try.

From the microsolar data sheet, with an ambient of 25c, the heater can produce 70c. From their actual installation in a winter country test, ambient with -1.1c with overcast sky, the heater produce 43.3c. (wonder it is true )

Microsolar heater don't have heater backup inside the tank from the spec they wrote. It wholly depend on the vacuum tube to generate hot water. So I guess they are confident that the efficiency is high enough to produce hot water in whole yrs even in some rainy month.

With such high efficiency, you able to install at mountain side with crazy cold weather, cold water and no electrical for backup. This is the true solar heater purpose intention.

But it is not cheap. So I comeout an idea which use the smaller model (at least cheaper) to produce more hot water. In liter not hotter water. Specially rainy day.

Another problem with solar heater is the expansion. You get a 3person model because currently you have 2 person in the house only. ( when you get a new house and install) Gradually, your family expand. More kids and parent maybe. The solar heater can't produce enough for the expansion. So you got to get a bigger size which cost you another RM5-6k ? Or add another set of solar heater? I believe many people won't change it with that cost. So they just add an instant heater.

I don't need hot water when full day sunlight weather. But I need hot water when in rainy cold weather.

Others maker should put more data detail to claim their efficiency.

Challenge their product by install it at the Mount Everest. The climber able to enjoy hot water at -0c.

Take 1 example that you wrote the microsolar spec where M60VTHE for 6pax (250L) - Max temp 95ºC

With such a normal day temperature at 95c, definitely it can use more than 6person. Hot water mixing ratio is lesser. Another reason is, it is normal day. Not cold day.

If in rainy day at 25c, microsolar can raise to 70c. It enough for 6person. (Using your Aquasolar spec) You don't need a backup heater.

For others brand, since it is not that efficiency, they have to use bigger capacity tank to compensate the lower temperature. Since you can't raise more higher temperature for hot/cold ratio. And of course you got to be sell cheaper. You don't sell a BMW cheaper than a camry.

It is also like iPhone and android product. Microsolar holding the patent of their heater efficiency design. Sure their price will be higher since no 1 dare to copy here.

Your meaning of 60c is enough and cause burn are wrong explaation example. For the solar heater, raising the temperature as high as possible is the every company goal. No 1 will just stop at 60c and tell that is enough. Eventually others will go ontop of you. Go and challenge the microsolar.

And if you said 60c already can cause burn, should the manufacturing lower down the temperature for the safety reason? When you sell such a hot water product, you have to teach them the procedure of how to open the mixer in a safer way.

A typical water temperature for a comfort shower is around 31c-35c. Where 35c is in cold day. You only can withstand of 38c in short time. My record that I can stand for 5min is 42c ! When I go for onseen. It cook my ball.

It is not the vacuum tube patent. But the technology inside the vacuum tube of how the cold and hot water flow to make it more efficiency. They explain that from outside, everything look same. But inside is different.

Normal maker is using the market available standard vacuum tube. Which is from china normally.

Vacuum tube use sun radiation and ambient temperature to heat up the water inside the tube.

I don't no wor. Go to the website and read lar. The spec everything is in there.

And correct me if I m wrong.

My knowledge is limited. I m form 5 leaver only.

Maybe got hidden technology beside the tube.

Here is the way angmoh friend teach me when stay at his house.

Open the cold water tap first. Than only slowly open the hot water tap. adjust the hot water till you comfort. Doing this way,

1) will makesure you don't get burn by the hot water.
2) save your hot water amount. As the hot water flow later with lesser amount till suit you.

I can confirm it cause 1 of my friend is using microsolar model M80VTHE.

The patent is file at here. Not in china. China is producing most of the vacuum tube for all the standard solar heater. Cost down ma. If microsolar file the patent in china and not here, any solar maker here can copy their design. Can't sue them either.

Please think about safety 1st. You can do that with turning the hot water 1st. Cause you understand it will take longer time to flow out.

But will you teach your kid and the customer using this way? If your guest stay in your house, can he know how long will the hot water flow out if you tell him open the hot water 1st?

You can minimize the waste by insulate the hot water pipe. And don't use pipe bigger than 1/2" size. This already be done by some people here and prove to be effective.

For the high temp or the capacity, this is very much depend the manufacturing of how they calculate the cost and the efficiency. If that company have the technology that can achieve the highest efficiency, they can reduce the material and size of the heater to produce the same result of the standard temperature. Isn't this will reduce the cost and get profit more?

I don't understand what is your point of waste the energy in the pipe. 90c water in the pipe vs the 65c in the pipe. Isn't it is free energy anyway?

If you said the litre amount is waste are the same, but the storage of 65c is bigger, isn't a 65c require mixing of hot water ratio is higher than the 95c? The amount of litre hot water using for 95c is lesser than 65c.

Bro, very expensive wor. It is not some short pipe we are talking about. And it conceal inside the wall.