Bosch Hot Water & Heating Electronic Highflow 21e

We have 5 of these at our accommodation business along with other brands
Cannot recommend them highly enough.
Never had a problem with them and they are easily adjustable for temperature control.
have 2 bosch professional on as well, and after a few hiccups they are also performing very well.

The old storage gas hot water system in the roof cavity failed after 30 years (Beasley) but it was installed during major additions and to replace it would mean removing part of the roof or ceiling. So we had a Bosch 21e installed outside. It has been 3 years and it has been reliable with no problems at all. I installed a BOSCH MAIN CONTROLLER YPRM67XBN (about $100) not long after the heater was installed and it was the best thing I ever did. We rarely need to use cold water because the controller can be set to any temperature between 37 and 50...

This hws has been totally reliable and great at supplying us piping hot water over the past several years. It has never even been serviced oops.
I am wanting to be able to adjust the water temp now though as our new dishwasher needs a lower temp for ingoing water (there is only a connection to a hot water pipe).
I am unable to open the 4 screws on the unit.. done up so tight, none will budge. As I need to call a plumber out to adjust temp anyway, I was wondering if a controller can be added to the unit and will it give me the full range of temps ie 50 to 75 degrees? How much do the controllers cost approx.?

You don't know you have lived until you purchase a hot water system with remote temperature controller units.

Firstly the house we bought back in 2015 had a 10L/pm unit in, can't remember the brand but they are common as muck and the hot water trickles out.

Going from 10L/pm to 21 was like a dam busting open full of hot water.

We bought our unit 2nd hand from a demolition recovery yard for $200 and it has worked flawlessly in the 18months we have owned it.

I went out and bought 2 remote temp control pads and fitted to the bathroom a...

Everything! Looks good, performs well, and has saved me a fortune on electricity. If I could sleep with it I would but my wife gets so jealous that I am afraid to take the chance. My best friend is renting and he has been trying to persuade his landlord to put one in but so far, he is behaving like so many other landlords do. It might have been a mistake to tell him about my wonderful heater as the relationship with his landlord is deteriorating fast, which is sad, because he fancies the landlords wife.
Price, Performance, Economy.

What is wrong with the rest of you? This machine (21E) works great!!! We love it! Temp only fluctuates if another tap is turned on. We would not hesitate to buy another one! Make sure you have it installed properly by a professional, then you'll have no probs, like us!
Delivers constant hot water always. Great when you have people staying, & you never run out of hot water.
Takes a while for the hot water to hit our kitchen sink (furtherest point from the heater), so a lot of water is wasted. Fluctuates in temp only when another tap is turned on.