Laars Endurance Boiler

Scott06

Does anyone have any experience using the Laars Endurance gas-fired boiler in a retrofit job with cast iron convectors. The existing boiler was a cast iron boiler with a higher water content to it. I need a gas-fired boiler with direct vent, sealed combustion capabiltities and Net Btus of around 150,000. The Endurance fits those needs. My concern is with the large water content of the heating system and low water content of the Laars boiler. Laars says it will work fine but they dont get the headaches after installation. If you have any thoughts please let me know.

Gary Fereday

Just arrange

a control set up that would insure return water to be above the condensation point + - 140*F. Bypass of some kind, set or automatic. . jmho bigugh

Steve Miller

Endurance boilers

The nice thing about the Endurance is the small footprint. You don't have to worry about low return temps with the built in buffer tank if your using the EBP and there's an anti condensate thermostatic union on the EDP. They're also sealed combustion so you don't neet to worry about combustion area requirements. Make sure you know how to use a magnehelic and a gas analyzer, you may need to set the gas/air mixture. The only problems I've seen were the early control boards, which Laars was great about replacing and I think they have the bugs worked out of it now. The only remain problems is the flow switch on the EBP models. We've replaced every one within 18 months, they're made of plastic and the body just starts leaking. In one case it fryed the combustion blower because it's right above the blower. As far as I can tell the replacements haven't been redesigned. It doesn't say this in the installation manual but install a union right outside the case on the cold water inlet that goes to the flow switch, otherwise it's almost impossible to replace. It's so tight inside the boiler, it's REALLY hard to even get a wrench in there to remover the flow switch. Also, good luck with the tech department at Laars. They may know the boiler a little better now that it's been out for awhile but when it first came out, the tech people I talked to were clueless. Thankfully I was able to answer my own questions from installing and servicing Heatmakers for 15 years. Other than that, I think it's a great boiler and lends its self to many applications.

Steve m.

Gary Fereday

Thanks Mr. M

I figured that someone would straighten me out if I were out of date! I have used several Laars units but that was at least 5 or more years ago. I appreciate learning anything new. I just about looked up the "Endurance" befor I posted. Glad now I did not, as your assessment was excellant.bigugh

Paul Rohrs

Endurance

We did a job 2 years ago with 13 of the endurance boilers. It was all radiant floor heat, zoned by circulator with outdoor reset. We had 31 separate zones of heat and a total of 50,000 linear feet of 12 HePex. It went very well even without a buffer tank. We did experience a few problems in that the system was filled with water at about 30 Grains of hardness and a few other nasty items. Within 4 months, you could not get a pencil tip through that 58 helical coil exchanger. So, the boiler started hammering,(flashing to steam) until the coils were replaced or cleaned. I (the wholesaler) went out and replaced a few of the Printed circuit boards, but overall, Laars makes a quality procuct.

Paul

Joannie

Endurance

Steve, thanks for the response.

Yes, we had control board problems at first, and believe we have those straightened out. As far as the flow switch goes, our supplier has indicated to us that they have corrected that problem. As added insurance, we have added a cover over the blower motor, so if the flow switches do leak again, at least they won't take out the motor.

This product was being designed by Trianco before we bought the company, and we did have problems with product knowledge at the beginning. I believe we have taken care of that, but if anyone has any Endurance questions that they are having trouble finding answers to, please feel free to email me at jmishou@laars.com, and I'll be able to help you get the answers you need.

Thanks,

Joannie Mishou
Laars Heating Systems

steve gates

Joannie

I also just ordered two flow switches. We were able to let the inducer fan dry and it restarted. Can we adapt these covers on the older machines? I noted holes for them?

Joannie

Blower Cover

Hi, Steve.

Yes, you can put the cover on in the field. My Service guy just told me that it's the cover and three screws. Check your email. I can give you details.

Joannie