Watkins SilentFlo Circulation
Pumps Factory Replacement Single
Speed (E5) & Two Speed (5002)
Circulation Pumps for all Hot Spring & Tiger River Spas
Silentflo E5
Newest
factory upgraded replacement circulation pumps to replace
all previous style circ pumps used from 1986-2007
Silentflo 5002
New for 2008!
Newest
revision for 2008!
Over the years Watkins Manufacturing has distilled
down their dependable circulation pumps to two models.
These two models are used for all circulation pump replacements
in all Hot Spring Spas & Tiger River Spas. Our SilentFlo
pumps come with a (1) year limited warranty from Watkins
Manufacturing, the makers of Hot Spring & Tiger River spas.
See our warranty policy.
Your factory original circulation pump will look like one of the pictures below
Cal-200 &
Cal-500
Laing 303
SilentFlo 5000
SilentFlo
5000
Silentflo
E5
1985-1988
1989-1994
1994-1995
1995-2008
Discontinued
Discontinued
Discontinued
Limited
Supply
Before Replacing: If your circ pump isn't moving much (or any) water through the system, there may be some easy fixes.
• Is your heater
reset button tripping or your red power light blinking? The #1 cause of this nuisance is low water flow through
the heater. The #1 cause of low water flow is clogged filters.
Even if they look clean!
From 1989 forward, all Hot Spring and Tiger River circulation pumps draw
water from a single filter. If that filter hasn't been chemically cleaned (recommended
every 3 months) then the circ pump may not be able to drink enough water per
minute. Once it draws water from the filter it then pushes it out to the heater.
A semi-glogged filter causes that water to travel too slowly through the
heater then overheats. The heater high-limit (heater reset button) or high-limit
thermistor trips off shutting down the heater (and the jet pump & light on some
models) because it thinks you have drained the spa and forgot to
power it down. This safety device prevents a melt down (dry fire heater).
To eliminate a clogged filter as the culprit, clean your filter(s)
with an approved spa filter degreaser. There are two types
of filter cleaners for spa filters, ONLY USE A DEGREASER.
The other type of filter cleaner is for removing calcium deposits
which is an acid type cleaner that will permanently
set up any accumulated lotions, body oils and cosmetics on
your spa filter(s) and ruin them! Filters should be replaced
every 3-5 years. • Is there any water at all moving through the system?
If your spa has sat dry for any length of time, the circ pump impeller could
just be bound up.
We usually just tap on the wet end of the pump (the end where the vinyl tubing is connected) with a screwdriver handle. More times then not, this will un-stick the impeller.
If none of these suggestions help, then the circ pump is most likely tired.
Silentflo E5 
