Free hot water with a solar water heater

A forum for DIY, cars, pets and all things related to home life
User avatar
Zasso Nouka
Tech Support
Tech Support
Posts: 4188
Joined: Wed Sep 23, 2015 9:37 am
Location: Chiba Prefecture
Has thanked: 3639 times
Been thanked: 2994 times

Free hot water with a solar water heater

Post by Zasso Nouka »

This might be useful for someone in the future. Our water heater sprung a leak last week where the vacuum tubes enter the tank, the repair is quite easy. You are going to need a 22mm socket spanner, maybe an impact driver, some silicone heat transfer grease and a small-ish file and some of these

Image

No idea what they are called but presumably MMC sell them, the guy that fitted our tank ordered them from MMC. The black one is the old one that corroded through at several points, the shiny one is the new one and the pack above are how they come.

First cut off water supply and then remove the vacuum tube where the leak is, may need to spray the cup holder with silicone spray to loosen it. Store the tube somewhere safe out of the sun or the copper tip is going to get really hot and you won't be able to apply the silicone heat transfer grease. There will be a silicone grommet covering the 22mm nut inside where the vacuum tube meets the tank, take this off and unscrew the 22mm nut, may need your impact driver for this bit if there is some mineral buildup. Insert the file into the receptacle, or whatever it's called and rotate to free it up (you use a file because it's rough edges will grip the receptacle and allow you to rotate it free), water pressure will then pop it out and insert the new one and secure it with the 22mm nut. Use your 22mm socket wrench to tighten not your impact driver, this should be done slowly and cease as soon as there is no longer any water dripping. Turn water supply back on and refill tank, if water starts dripping tighten up the 22m nut a little more until it stops dripping but don't over tighten.

Apply silicone heat transfer grease to your vacuum tube and shove the silicone grommet back in place then re-insert the vacuum tube, tighten up plastic cup holder and the job is done. Open up the pressure relief valve on the top of the tank to allow any trapped air to escape and you should be good to go.

User avatar
Zasso Nouka
Tech Support
Tech Support
Posts: 4188
Joined: Wed Sep 23, 2015 9:37 am
Location: Chiba Prefecture
Has thanked: 3639 times
Been thanked: 2994 times

Free hot water with a solar water heater

Post by Zasso Nouka »

Here are some pictures of the file used to remove the 'receptacle'

Image

And with the file pushed into the 'receptacle'

Image

Hope that makes things a bit clearer

vapidspants
Posts: 6
Joined: Tue Jan 07, 2020 9:16 am
Has thanked: 6 times
Been thanked: 7 times

Free hot water with a solar water heater

Post by vapidspants »

Perhaps a silly question, but could a solar water heater be hooked up to an outdoor pool? I guess I am thinking of an outside onsen, but without having to do the excavation or expensive digging to reach geothermal water.

User avatar
gonbechan
Founder
Founder
Posts: 1928
Joined: Wed Sep 23, 2015 9:10 am
Has thanked: 2367 times
Been thanked: 1341 times

Free hot water with a solar water heater

Post by gonbechan »