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  Reply # 1092516 20-Jul-2014 15:25
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You need to measure the height difference between the cylinder and the point you will be installing the relief valve. This height + 3.7m (relief valve rating) can't exceed 7.6m

[edited to add]

Don't install a relief valve if there is a wetback fire connected to your cylinder. The cylinder may explode.

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  Reply # 1093927 22-Jul-2014 20:57
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Hey OP, I had the same problem when moving into my new (rented) house.
As the owner wasn't keen on installing anything I had to make do with the existing parameters and troubleshoot the thing myself. I know a few of these are mentioned in the thread, I don't know why you want good hot water pressure, but 99% of the time it's for a shower?
But here's simply my process I followed, and how I got a satisfactory shower.
  Step 1. Check if the shower 'rose' has a pressure restrict valve at either end of the flexible pipe. If so remove it.

Step 2. Check if your shower mixer has a pressure H / C relief valve next to the mixer unit. (you'll need to remove your hot water "handle" base plate, usually performed with a 4-6mm allen key poked into the hole at the bottom.) Hopefully the hole in your wall is large enough to see, let along distinguish how to identify which is increasing and decreasing.. (For me I was unable to see these at all.)

Step 3. Check whether my hot water cylinder has a variable pressure relief valve. See: http://www.youtube.com/watch?v=eDxx_od_LL0] Youtube link to identify and change your pressure relief valve.

Step 4. If in step 2 you have a pressure relief valve, take a photo to represent current state, and make gentle rotations only a 1/4 at a time. If possible have a friend monitor the overflow valve.
Basically I turned mine until only cold water sometimes comes out. (Some tanks are smart enough that if you overpressure them they release cold water over hot to relieve pressure)

Step 5. investigate turning up your hot water cylinder temperature. The default for many is 60degC (as is required to kill legionaires or something..) I increased mine substantially.. (word from the wise, if you have kids skip this option.)

Step 6. Buy a new specifically "low hot water pressure shower rose" they can be costly, around $100.

Step 7. Hopefully you have awesome hot showers by now, if you don't (like me) the last step is understanding why you have crappy mixed pressure at a desirable temperature, which is your cold water is literally overwhelming your hot water and restricting it's flow. So in turn you need to restrict your cold water flow. So yes, I went to the road and severely restricted my cold water pressure.

Only then was my hot water pressure at my rose acceptable (I'm not talking the best of the best, but enough to rinse suds from your hair without the need to take 10 minutes and vigorous hand movements!

Hope this helps OP and anyone else interested. It took me a few weeks to get all this information together, so hopefully it works for someone else!

 
 
 
 


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Ultimate Geek
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  Reply # 1096036 26-Jul-2014 11:27
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kiwitrc: You can get a shower boost pump if its just the shower you want to sort out. This wont affect any of your other plumbing.

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They are cheap, they work well, it's not just the shower you can hook it to.


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