A rant on fresh water pump location....

Usually not. Some also put the pumps above the tanks so they are not self priming if you empty the tank...

My tanks are located outside the engine room, so after the initial warm water, it runs cool. Its convenient to have equipment located in the ER for accessibility?

Noise, if it springs a leak, etc. a lot of manufacturers 'put them there. It just is what it is.

The thing about the Mach 5 liquid cooled pump is from a thermodynamic perspective, , it adds 3.412 BTU's of heat to the water for every watt the motor consumes. Volts x amps = watts, if you know those two numbers.

I had an older 57' Jim Smith that had a mechanical room below the galley where all the pumps, a/c's, chargers, and etc. were located. The mechanical room was not hot even though there was no door on the opening to the ER. Also, there were only engines in the ER (imagine that!)and roomy with good access around the engines. Another feature was large hatches over the engines which could easily be remove to give great access for engine maintenance. Another plus was the double salon doors which would allow easy engine removal if needed. The generator was in the lazerette. It was a good setup and often wonder why more builders did not copy the design.

Why on earth did you get rid of that boat for a hatteras? What speed did it cruise at and wot? 8v92's?

Capt J, I have ask myself that same question many times. It was repowered the 80's with older 12cyl Mans 700 hp and cruised 25kt @1800 with 1/2 fuel and about 30kt wot@2350. The only problem was the accommodations were tight below. Should have remodeled that Gal. The setup was the way all boats should be designed for maintenance. I could reach everything in the bilges. It also had a cockpit deck fill for the fuel tank so you could stick the tank to verify fuel. When you add up all the design features it had everything you would want except sleeping accommodations if building a boat....Sellers Remorse. Sold the Hatt a year ago and been looking at Pilothouses. Liked the 50 Hat too except very tight ER with 3412's. Sounds like Pascal made a mechanical room for some equipment on his Hatt. Well worth the effort to relocate equipment to a separate space out of the ER if keeping a boat long term, if the space is available.

Mechanical pump rooms, engine patches, wow, those old school builders knew a thing or two. Funny how some things get lost in generations.

It is all about purdy...if my last boat had a 3412 that needed to come out...would have been a major operation.

Read about all that work you have scheduled for your Hatt. Perfect time to move stuff where you want it.

Yes, I have lived that. Especially when they brought the auto industry into ours. It is all about features and design, access be damned.

Math is a little off there wdrzal ...

If that water cooled pump were operating on 115V at its maximum pressure of 50 psig and moving 8 gpm of fresh water, and the motor were somewhere around 80 percent efficient, it would add only 853 BTUs per hour. Just enough to heat that 8 gallons of water less than 2 degrees F, and then only if the pump were heat soaked already.

Since Energy "can't be created or destroyed" as we understand mechanical & electrical engineering, All the electrical energy is transformed into work (what the motor does ) and heat. Every watt needs accounted for. I didn't calculate water flow ,head pressure or temperature rise since I have no numbers for those variables.

What is the amp draw @ 115 volts ??? or just the wattage used per hour.
Motor inefficiency (as related to heat output) doesn't matter when your measuring the power the pump is consuming directly.