Jan 25-27, 2016


March 16 - 18, 2016

2016 CMPX SHOW - Toronto, Ontario

With over 250 exhibitors, free seminars, technical workshops, and much more CMPX is Canada's largest expo for plumbing, hydronics, HVACR, and water ...


What venting systems are approved for the Sime condensing and non-condensing boilers?

Sime condensing boilers are approved for the use of standard polyvinyl chloride (PVC) venting. This is about the most inexpensive venting material available. The Sime non-condensing boiler vents gas at a higher temperature, requires venting that has a higher melting point, and is somewhat more expensive. However, we supply the first 90° elbow and the termination for this boiler, so in many cases where you are mounting the boiler on an outside wall, this is the only venting you will need.

Some manufacturers say that their boilers are field convertible from natural gas to propane, or from propane to natural gas. Does Sime offer this feature?

Sime provides boilers that are specifically configured to operate on natural gas or propane. We do this for two reasons. Firstly, we want to ensure that our boilers operate at the peak efficiency. To do this requires both adjustments to the way the boiler operates and ensuring that the correct burner ‘jets’ (referred to as orifices) are in place for the type of gas being burned. Second, if a mistake is made in the field and the boiler is set up to burn one type of gas, but burns the other type, serious consequences can result, up to and including carbon monoxide being released into the building. 

Can I use anti-freeze in my heating system?

Yes. You can use propylene or ethylene glycol (not automotive anti-freeze) up to a solution of 50% by volume; that is half water, half glycol. The resulting solution is more viscous (thicker); therefore, the pump that is built into the boiler will not be able to pump as much fluid through your system compared to if you are using just water in the system. You must use an inhibitor with the glycol (see below).

I understand you require that I must use a cleaner and inhibitor in my system when I install a Sime boiler. Why is this?

We highly recommend that your contractor use a cleaner when installing a Sime boiler. This is particularly true if the boiler is replacing one in an existing system. Over the years, debris from the various components of the system builds up in the system. The tolerances in your old boiler may be such that this has not caused a problem. However, with today’s new equipment having much tighter tolerances (just like your new car engine, compared to that of an older car), this debris can clog up some of the components in the boiler. With a new system, as long as the system undergoes a cold and hot flush, adding a chemical cleaner is not as crucial but still recommended, as bits of solder or solder flux, for example, may find their way into the boiler.

We absolutely require that a chemical inhibitor is used in the heating loop. We have found that without this, debris can come loose, causing fouling in the boiler. In fact, if an inhibitor is not used, our warranty is invalidated. A couple of examples of commonly used inhibitors are those made by Fernox and Sentinel. We accept these products and others that are demonstrated to perform similarly. Today’s boilers are highly sophisticated, and protecting this investment is simply common sense. 

How do Sime boilers perform at higher altitudes?

There is no technical height restriction for Sime boilers. The boilers are set up by adjusting to certain carbon dioxide percentage targets at maximum power and minimum power. These values are independent of the altitude at which the boiler is installed. However, the boiler will be de-rated depending on the altitude; for example, at 7000 feet the boiler will operate at approximately 83% of its maximum input. Therefore, you will need to account for the fact, that at altitude the boiler will produce less heat. This is true for all heating appliances due to the fact that the higher you go, the less dense the air is.

How do I get the air out of the heating system?

All Sime boilers come with pumps that have air eliminators built in. Your contractor will open the eliminator up to bleed the air out of your system.

Cold water holds more air than hot water, so when first filled with cold water, the system contains a lot of dissolved air. Once your boiler heats the water, the air comes out of solution and moves with the flow of water. It is important to remove the air because it can block the flow of water. Air will also cause noise as it moves though the pipes

A heating professional will also use automatic air vents at the high points of a system to eliminate air bubbles that do not generally move downward with the flowing water back to the air eliminator because of their buoyancy. 

Do I need a low water cutoff added to the system?

A low water cutoff prevents the boiler from operating if the system has less than the recommended amount of water in it. Sime boilers are equipped with a pressure transducer that cuts off power to the ignition sequence if the pressure of the heating circuit water falls below 0.7bar (10.2psi). For boilers that are installed above the radiation level, inquire with the Authority having jurisdiction for additional requirements for low water cut-off devices at the time of installation.  Section IV of ASME BPVC and the B51 Boiler, Pressure Vessel, and Piping Code accept water flow switches for boilers required forced circulation, which are factory installed in all Sime boilers.  

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