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 Tigerloop® FAQ

Tigerloop® - Frequently Asked Questions


                            read this... "Tigerloop Is Reliability.pdf"


Tigerloop® Frequently Asked Questions

1.  Who should install the Tigerloop?

Heating systems, as well as system components like the Tigerloop, must be installed and maintained by a qualified technician that is familiar with oil heating systems, equipped with the proper tools and equipment, and licensed by the proper authority were applicable. Installation and maintenance by an unqualified person can result in hazards to that person and others. These hazards may include spillage of fuel oil, fire, severe burns, damage to system components, and other hazards. In short, a Tigerloop, like the other components on a heating system, is not a do-it-yourself item.

2.  Can I run two burners on one Tigerloop?

No.  Each burner needs its own Tigerloop. There are many reasons to use one Tigerloop per burner. Possibly the most important reason is that you could exceed the capacity of the Tigerloop by sending too much oil through it. This could generate a back pressure that could blow the seals on the pumps. The Tigerloop is rated for a maximum firing rate of 20 gph, and a maximum return oil of 30 gph. This is completely adequate for 1 burner, but you can approach or exceed the maximum when you add the second burner. The problem is that with some rebuilt pumps, you may have a larger gear set inside the pump. Pump rebuilders do this to compensate for worn pumps. So if you use a rebuilt pump, you could overflow the Tigerloop. Also, while you might install 2 brand new pumps which have never been rebuilt, a different service technician might come along later and replace that pump with something else which could then overflow the Tigerloop. You don't want to set someone up for failure later on. Also, Tigerholm has designed the Tigerloop for use with only one burner. Underwriters Laboratories has tested the Tigerloop and has allowed the Tigerloop to be a UL Listed product to be used only on one burner. You don't want to be in a situation where there is some sort of problem, and you have done something that defies the written instructions of the manufacturer, and does not comply with UL's requirement. In addition, the Tigerloop is a complicated device that is doing a balancing act by mixing inlet oil with return oil while simultaneously de-aerating the return oil. You make it a lot harder to separate the air if you double the velocity of the oil flow through the unit.

3.  Do I need to install the bypass plug?

Yes. The Tigerloop will not work unless the bypass plug is installed in the pump to set it to "two pipe" operation.  The bypass plug does not come with the Tigerloop, it comes with the pump.

4.  Does the Tigerloop need a filter?

The Tigerloop should have a filter installed.  If an oil filter is used (recommended), it must be installed in the oil line between the tank and the center port of the Tigerloop.  If you install one of the "ULTRA" models, the filter is already included.

5.  How can I get technical support information on the Tigerloop?

If you are outside of the United States you need to find your local distributor by going to:

If you are a homeowner, no technical support is available.  We do not offer technical support to unqualified persons who are unfamiliar with heating systems. Call your service technician.  He is familiar with your system and has the necessary experience, training and skill to service it.  For liability reasons, there is no exception to this policy.

If you are a service technician in the US, you may call us at 1-800-442-1630.  We will validate your status as a service technician and then answer any questions you have.

6.  The Tigerloop is completely filled with oil.  Is this okay?

As for the fuel level in the bowl of the Tigerloop:

1. Original model Tigerloops (old style with only one chamber) can be almost empty to completely filled and it is perfectly normal.
2. Current model Tigerloops (with two chambers, upper and lower): The lower chamber can be almost empty to completely filled and it is perfectly normal.
The upper chamber should not have enough oil in it to cause the upper chamber float to float. If so, the Tigerloop must be replaced.

With all models, the fuel level can change over time, especially after an oil delivery which can introduce air into the dome.

7.  Can I service or clean the Tigerloop?

The Tigerloop has no serviceable parts.  It is sealed at the factory and cannot be opened without destroying it.

The Tigerloop can only be cleaned by wiping with a dry cloth.  USE NO CLEANERS OR ALCOHOL which will damage the Tigerloop.

8.  What additives can be used with the Tigerloop?

Since it would be impractical to identify and test  the many fuel additives that appear on the market,  much less keep abreast of their latest formulas, no testing or evaluation of additives has been done with regard to their use with Tigerloops. Therefore, the decision to use an additive in a system on which a Tigerloop is installed is not recommended and is solely the prerogative of the person responsible for that system, and the consequences of such use rests with them alone. And while it is hoped that the manufacturers of fuel additives have formulated them to be compatible with, and no more harmful to the system than, fuel oil, it is the responsibility of the person choosing to use the additive to insure that such is the case.  Introduction of an additive directly into piping, filters, pumps, Tigerloop, etc. without being first mixed and diluted in the fuel tank may cause serious damage to the system and components.

9.  What is the maximum lift and run for the Tigerloop?

The Tigerloop has a maximum lift of 13 feet.  The maximum run varies according to pipe size and nozzle size.  Refer to this chart for maximum Lift and Run figures:
                                        Tigerloop Run Lift Chart pdf

10. Can I use a Tigerloop with an overhead line?

Yes, but overhead lines should be avoided whenever possible as they accumulate air in the overhead sections and then suddenly pass large amounts of air into the burner.  The instruction sheet which comes with the Tigerloop has some suggestions on how to pipe a Tigerloop to feed the air in smaller  more manageable doses through the Tigerloop.

11. What is the maximum firing rate of the Tigerloop?

The Tigerloop has a maximum firing rate of 20 GPH (or 40 GPH for the Tigerloop Twin S220-15).  The maximum return oil flow cannot exceed 30 GPH (or 60 GPH for the Tigerloop Twin).

12. I just installed a Tigerloop and I can’t get it to draw oil from the Tank.  What is wrong?

The Tigerloop fills by collecting return oil from the pump. If the pump is not returning oil to the Tigerloop it is likely that the “bypass” plug has not been installed in the pump. If the bypass plug is not installed, the pump will suck air into the return line instead of returning oil out of it.

13. Do I have to connect the return line from the pump to the Tigerloop?

Yes, the Tigerloop uses the return oil from the pump to operate the floats and diaphragm valve to determine when to vent air and when to loop the oil back to the pump.  If you don't connect the return line to the Tigerloop, the burner may fire but the Tigerloop is performing no function since oil never reaches the "de-aeration" chamber and oil cannot be looped back to the pump.


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