Salamander Negative Pump Pulsing issue

[SimonG]

That's not a plumbers work, maybe handyman or diy.

Not enough info on if a negative head shower is required.

How did you keep costs low on the negative head pump?

 

[ShaunCorbs]

That's not a plumbers work, maybe handyman or diy.

Not enough info on if a negative head shower is required.

How did you keep costs low on the negative head pump?

Second hand pump

 

[budedwards]

Plumber is the issue and negative head wouldn’t effect / cause the pulsing

I've asked another plumber to quote.

watching plumbers youtube channels they do seem to fit the pumps in the same way so this is a common issue/mistake i'm guessing.

They say the rule of thumb is use a negative head pump if you are getting less than 1Ltr per minute flow, i am getting around 3 Ltr per minute so on that basis i could of gone for a positive head.

 

[SimonG]

Flow rate has nothing to do with positive or negative head pumps.

 

[budedwards]

Flow rate has nothing to do with positive or negative head pumps.

What is the method to decide if you need negative or positive?

 

[ShaunCorbs]

Any links to these channels ?


Height of shower and the type of shower is the deciding factor eg pos vs neg

Also neg / universal can be used in both types/ situations

 

[budedwards]

Any links to these channels ?


Height of shower and the type of shower is the deciding factor eg pos vs neg

Also neg / universal can be used in both types/ situations

View attachment 76830

Thanks Shaun you've been most helpful.

I'll let you guys know what the alternate plumber does to resolve but rest assured i will let him know your thoughts/recommendations

 

[budedwards]

so took it upon myself to swap the Negative pump for a positive one as i wasnt convinced the Negative pump was required or wasnt causing the issue.

Now have a positive pump in place and working perfectly.

Looks like (hopefully) i can avoid the fitting of flanges and expensive plumber refits.

 

[Ben-gee]

Up to you, but if it’s drawing air down the vent your new pump won’t last long….