Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: what is the difference compared to the auto circ recirculation pump with timer
Document: I have this same pump with a timer.The warrenty is worthless because Amazon is not an authorized distributor and Laing won't honor the warrenty. Trust me I had one fail after six months.
We like the size and operation of this pump.When using this pump as a re-circ pump for hot water it holds up fine if you can catch the crud in a pre filter that is in the water supply.
I bought this pump to replace an old Laing SM-303-BTW that failed after 11 years. This new pump has no timer and that's OK. For ease of access I had decided to use a standard appliance timer that plugs into the wall anyway. The new motor and impeller fit perfectly into the existing plumbed-in housing (the old and new housings look identical).
I used this pump as a replacement for an existing Laing pump Model No. ACT-303-BTW (with timer). The motor/impeller fitted into the existing pump body and did not require any plumbing changes. This pump was considerably cheaper since it has no timer. I got around the timer issue by using a HW2190 Heavy Duty Remote Control switch ($19). The remote has two buttons, on and off. We turn the pump off when we are not using the hot water.
I bought this to replace my old model Laing SMT-303-BSCW. The old model was 33 Watts with timer and ran for 12 years. This one is 12 Watts with variable speed only; that's fine since we ran the old model 24/7 and essentially never used the timer - relied on the thermostat cut-off.
This pump is a little noisier than the 7 years old pump it replaced.
The pump arrived quickly and we had it installed the same day. Works like a charm. No more waiting for the hot water.
Two Laing pumps have failed for me in the last 10 years. The motor failed on my first Laing. On the second model sm 303btw the rotor impeller assembly needed  a replacement part which is obsolete. So this pump is junk! I will not buy another.
This pump's fittings allowed for a very easy replacement of the older model. The directions said nothing about the flow adjustment, so I called Laing and found out the max setting is the same as the normal/fixed setting of my older model--so that's where I set my new pump (max).
The longest run from the water heater is 300 feet to my MBR shower, so a recirc pump is a must have for me.If you've run your system for as many years as we have, I highly recommend replacing the housing - ours was full of corrosion and deposits. I also replaced the check/swing valve which is between the pump and the return to the hot water heater - it was corroded and nearly completely clogged.
Answer: yes