I have oil-fired central heating system. Salamander ESP100 pump was
installed (by a pro) about 2 years ago to feed a mains-fed shower. The
pump is located on the same floor level as the shower. Over recent months
its been taking longer and longer for the pump to kick in when shower is
turned on. We have to repeatedly turn shower on off, and hold shower head
at lowest possible height before pump kicks in.
Any idea what is wrong?
Also, the darn thing is extremely noise; I have placed it on top a price of
carpet on top of chipboard flooring boards (the problem described above
started long before I did this so). Any other suggestions to reduce the
Sounds to me like the flow switch(es) are shagged. Ours has reed
switches which are ca 7pounds each from the manufacturer, or a couple
of quid from Maplin. Don't know what other sorts of flow switch are
If the pump hasn't always been noisy, then I would suggest that the
noise is either (a) air in the pump, or (b) the bearings on the way
out. (a) will lead to (b) as the bearings are usually water
lubricated & trapped air will cause them to run dry & wear out.
Air can be drawn from the water as it boils - under reduced pressure
(eg the suction side of the pump) water can boil at 60degrees C and
dissolved oxygen is released in the impeller area. Make sure your
cylinder thermostat is around 55degrees C or lower. try turning it
down until it is too much, then nudging it back up a bit. The damage
may already have been done, but you might slow its demise.
BTW I was thinking of buying a Salamander pump when the current
incumbent expires. Maybe not now....
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