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  #1  
Old 04-16-2012
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by passing Water Heater

I need to do this since the HW is not needed unless I'm on the boat for a trip.

I've been wondering however; Can the coolant lines from the engine just be turned off with a valve in one of them? Seems to me they are "accessory" connections and should not interfere with engine coolant flow.
car heaters work that way, no?

jus wonnering
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Old 04-16-2012
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Re: by passing Water Heater

Yes, assuming the heater is hooked up in parallel, not series, with the engine as is the usual way, it can be shut off. Not clear why you "need" to do this.
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Old 04-16-2012
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Re: by passing Water Heater

"rotten egg smelly water" from the heating and cooling I suppose. it's a new WH too.
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Old 04-16-2012
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Re: by passing Water Heater

I put ball valves on the coolant lines from the engine which go to the hot water heater as well as the return line back to the engine ( probably not necessary). I did this in case there was some kind of catesptrophic failure in the heater or the coolant line so the coolant could be shut off and not drain the engine

I do not shut them off as we use the shower all the time even though we dont often use hot water in the dead of summer I still run it so the stuff in the tank doesnt get stagnent or grow "stuff". The coolant always flow through the heater though .

dave
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Old 04-16-2012
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Re: by passing Water Heater

Valves on the coolant lines may be a good safety feature too Chef. The water in my HWH sits way too long and unused.
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Old 04-16-2012
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Re: by passing Water Heater

Hi Denise,

You need to see how your WH is plumbed. On many boats the coolant flows from the engine block output (hot) to the WH, then to the HX, and then back to the engine input (cold side). If yours is plumbed like that you can't use a simple ball valve because it would stop all coolant flow. You could T the line TO the WH and T the line TO the HX and put a valve before the WH.

Personally I don't really see why you need to do any of this. I would just run some water through the heater. If it smells, run more until it doesn't smell anymore and be done with it.

Barry
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Re: by passing Water Heater

What I've been doing Barry. I"ll look at it this week.
thanks everyone!
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Old 04-16-2012
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Re: by passing Water Heater

Denise, you mentioned a rotten egg smell. Is there a high sulpher content in the marina water? If so filtering the water going into your tank might help.

Our marina was on well water in Barnegat and the odor was much more pronounced with the hot water. Just a thought...

You may also need to flush through some water treated with bleach to kill any critters growing in there. After a bad experience all water going into our tanks now goes through a charcoal RV filter .

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Re: by passing Water Heater

Quote:
You need to see how your WH is plumbed. On many boats the coolant flows from the engine block output (hot) to the WH, then to the HX, and then back to the engine input (cold side). If yours is plumbed like that you can't use a simple ball valve because it would stop all coolant flow. You could T the line TO the WH and T the line TO the HX and put a valve before the WH.- Barry L

Our Yanmar 3GMF has two pulgs...coolant runs through the engine and also can run into the water heater. Putting the ball valves after the plug into the engine but before the hosing to the HWH alows you to close the coolant flow to the heater, but it still flows through the engine. Like I said its a safety mechanism in case of a hole in the hose to the water heater.

Dave
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Old 04-16-2012
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Re: by passing Water Heater

Your engine will warm up more quickly without the initial load of the 'cold' HW tank. However in previous boats we've had issues with re-establishing flow through the heater after it had been blocked. From a coolant flow point of view perhaps the safest thing is to pipe a bypass around the HW heater and keep the coolant flow(s) in the same path(s) all the time.

However, esp with a new heater the 'smelly water' should have nothing to do with the coolant coil in the heater - unless it smells like antifreeze. The domestic water piping/hose is a more likely culprit. Is it only the 'hot water' that smells?
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