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Why is the pipe passed by the outside, instead of by the interior and joining the sewage pie behind tge wc with an anti return valve? It is really small and must freeze so easiy otside. Maybe going lower with 45° x 2 instead of 1 90° may empty it better and resove the freezing thing. You could...

If your water pressure is too low you could fit a pressurising system, a small tank and pump that puts the pressure up to the required level. Not expensive (hrre) about 50 euros up deprndibg on the size. True that a diagram of some sort would help though. If I tried to explain the heating here...

Some of the heat exchanger sales sites do have calculators, maybe the more classy makes. Take a look at the sites that sell them on the web, I did see one, but can't remember which model it was. On some of the specialist hydronic sites they give quite a few equations, too.

With Open Source logicals, such as one of the Linux OS's, specifically written for IoT (smart switches, thermostats and the like, plus an all-in-one cpu board (Raspberry or other Pi for example) or your "old" laptop (they get a new lease of life with Linux!), with a telephone connexion add on...

It's a remplacement for the electrical heater in a water tank, and is powered by either a solar water heater or a boiler. I don't knpw how efficient it is, but it must save money! It's called a sidewinder. If you have lots of sun you could heat it up to 100°C, pushing it, but I reckon it would...

Dreams are hard to reach, but worth the pains to arrive.

Old diyer, looking for easy and cheap(ish) ways to eco-restore and power an old stone house.