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Post Info TOPIC: Coolant Expansion tank


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Coolant Expansion tank


I have a water heater that is above the engine and understand that I need a coolant expansion tank for this situation. I noticed that you have a metal coolant expansion tank that goes inline with the hoses that connect the engine to the water heater. Beta has a coolant expansion tank that connects the the engine via a single hose that appears to connect to the thermostat housing. Is one scenario better than the other?

The reason I'm asking is that my water heater is about 6' aft of the engine and there is no place to mount a coolant expansion tank high enough between the engine and water heater. I have a bit of room to mount a coolant expansion tank above and in front of the engine, which leads me to think that the Beta coolant expansion tank might be a better choice for me. Is there a reason you do not offer the Beta coolant expansion tank?

Thanks,

Bruce



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Hello Bruce,

The coolant expansion tank that we stock and recommend for water heater installations can be found at this page: www.betamarinenc.com/product-category/repower-centre/

We do not recommend the single hose version that you describe.

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Best regards,

Farron

Technical Sales and Service for Beta Marine, US Ltd. Minnesott Beach, NC   PH: 252-249-2473  farron@betamarinenc.com



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Farron,

Thanks for the reply. Is there a reason that you don't recommend the single hose Beta expansion tank?

Thanks!

Bruce



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It does not work as well. The goal is to prevent air from collecting in the run of water heater hose that is elevated over top of the engine breather cap. Putting the breather cap in that run of elevated hose works best.

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Best regards,

Farron

Technical Sales and Service for Beta Marine, US Ltd. Minnesott Beach, NC   PH: 252-249-2473  farron@betamarinenc.com



Veteran Member

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I have an Isotemp heater where the engine in and out are at the same level at the bottom of the tank (see picture). In other words, the engine in is not lower than the engine out on the water heater. Where do I put the expansion tank in a scenario like this? I had no issues with the old engine (Perkins 4.108) without an expansion tank above the water heater. I just had to loosen one of the hoses at the heater to let the trapped air escape and the water started circulating as intended.

Thanks!

Bruce



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Veteran Member

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Just checking in as I didn't hear back on my previous post. Thanks!



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The attached drawing should clarify the design.

Note that the release pressure of the header tank breather cap is a LOWER than the breather cap on the heat exchanger. This is crucial to to the success of the system.

RE: The single hose design. 

It does not work as well. The goal is to prevent air from collecting in the run of water heater hose that is elevated over top of the engine breather cap. Putting the breather cap in that run of elevated hose works best. 



-- Edited by Farron on Thursday 20th of February 2020 08:59:50 AM



-- Edited by Farron on Thursday 20th of February 2020 09:14:14 AM



-- Edited by Farron on Thursday 20th of February 2020 12:41:24 PM

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Best regards,

Farron

Technical Sales and Service for Beta Marine, US Ltd. Minnesott Beach, NC   PH: 252-249-2473  farron@betamarinenc.com

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