Salamander RHP 100 problem...

[DF123]

Hi All,

I'm new, so to start with I'd like to say hello!

I have a RHP100 (2 years old) fitted under my bath which feeds the bath and shower via a mixer (the sort with a temp gauge in the middle, a lower tap for the bath and a upper tap for the shower).

Recently I have noticed that the teperature is too cold when using the shower, but comes through much hotter if I turn the bath tap on and off again (but then goes cool again after a few seconds).

I have had the pump run dry a few times due to the header empying, but have stopped the pump as soon as noticed and managed to get the water back through the pump once the system has had time to fill up.

I'm concerned about cavitation / wear on the pump due to airation. Do my pumps symptoms suggest this could be the problem?

Any help or suggestions would be greatly appreciated.

 

[kawasakiracer]

hi it could be a number if things if your mixer tap has a thermostatic control that could be faulty it could also be badly plumbed or you could have a small storage tank in the roof and running out of hot water
things to consider :
storage tank to small
thermostatic valve not working
cylinder too small
badly plumbed hot from cylinder
have you added any other bathrooms or services from your hot supply
hope some of this helps

Hi All,

I'm new, so to start with I'd like to say hello!

I have a RHP100 (2 years old) fitted under my bath which feeds the bath and shower via a mixer (the sort with a temp gauge in the middle, a lower tap for the bath and a upper tap for the shower).

Recently I have noticed that the teperature is too cold when using the shower, but comes through much hotter if I turn the bath tap on and off again (but then goes cool again after a few seconds).

I have had the pump run dry a few times due to the header empying, but have stopped the pump as soon as noticed and managed to get the water back through the pump once the system has had time to fill up.

I'm concerned about cavitation / wear on the pump due to airation. Do my pumps symptoms suggest this could be the problem?

Any help or suggestions would be greatly appreciated.

 

[DF123]

Hi,

Thanks for the response.

Have just checked my documents and I actually have a RSP100, not the RHP100, which means that I don't have the bypass loop, so airation could have killed the pump prematurely.

I am definately running out of cold water, which obviously feeds the cylinder. Not sure how big cylinder is, but spose untill I sort the rest out i won't know if it's adequate.

I also noticed that the feed from the header to the cylinder is taken from directly below the mains water inlet, so I think that this may be a contributing factor to airation?

Regards plumbing, I plumbed it myself, so this may be an issue to. Due to the cylinder being in the back bedroom (where my young son sleeps) I wanted the pump in the bathroom. This meant plumbing up from the cylinder and through the loft, then back down into the bathroom (which is how the original 22mm pipes run anyway, I just had to tee off them). This is against Salamander recomendations, but I figured once primed it should be ok (maybe a bad call).

Another thing I have now noted is that there is a bleed valve in the 22mm pipe in the loft (probably because of the airated water supply), which again is against Salamander recomendations.

Come to think of it, the hot water has always been a bit spluttery....