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Adding heater to M5/M6


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I plan to add a heater to my 21 A24 because it was a dealer optioned boat and doesn’t have a heater. Can someone post pics/info of how factory connects the heater to the m5/6 engine and where the heater is located. 
 

Thanks in advance!

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I will get some M5 shots for you tonight. The heater core and blower literally rest on top of my sub box. You can put the vents about anywhere you want with long enough hose.

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Thanks!  I thought I had seen some pics of heater cores located behind driver seat, so wasn’t sure if that was new location vs under dash. 

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From heater core return line into the block is the bottom line pictured (right side of the block).
Hose from the block out to line pump is top line pictured (left side). 

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Edited by wdr
Cl
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In the heater coolant hose loop, the electric circulation pump is connected to the fitting furthest from the engine heat exchanger and is then plumbed to the heater core.  The other hose from the heater core goes to the heater return fitting on the engine which is closest to the heat exchanger.

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5 minutes ago, ahopkinsVTX said:

No, they are on the transom port side of the engine by the alternator:

 

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So that’s obviously not the heatercraft circulation pump they include in the elite kits. Do you know manufacture/model # for the pump?

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22 hours ago, wdr said:

Heater pump (left side) the hoses run aft across the transom and insert into the Fibecs behind the rear bilge pump on my LSV.

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Can you tell me manufacturer/model # for the circulation pump in your picture. Thanks!

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Brandonloos21

If I were you, I would see how much the dealer would do it for, perhaps negotiate it in by saying that you really wanted a boat with a heater. They can get factory heater and you can choose output locations. We ordered our boat new from factory, and our dealer recommended we didn’t option it with a heater, so that they could do it and we could choose where the hoses went. They’re charging the same price as factory, as well as warranting it. 

Edited by Brandonloos21
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It is a Johnson pump. SPXFLOW is about the only legible writing remaining on the pump. When researched it appears to be closest to the CM 30 model with @ a 6gpm flow rate, but I am not sure.

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6 hours ago, Brandonloos21 said:

If I were you, I would see how much the dealer would do it for, perhaps negotiate it in by saying that you really wanted a boat with a heater. They can get factory heater and you can choose output locations. We ordered our boat new from factory, and our dealer recommended we didn’t option it with a heater, so that they could do it and we could choose where the hoses went. They’re charging the same price as factory, as well as warranting it. 

I did ask and they said $1200. I’ve added heaters to my last 2 boats without a problem, this is my first with the cooling system so asking questions.

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