Too bad. These are nice pumps. Deliver a fair amount of water, and vary the pump speed to match water demand. Slow for brushing teeth, fast for a nice shower. However they are also pumps designed for the Recreational boating market.
This is one thing we have noticed on Viking Star – you need to be careful with equipment for boats. See – a typical recreation boat might see several nights use a year, a few weekends, and perhaps a couple of weeks Vacation. This is markedly lighter usage than full-time live aboard. A key example is indeed the Hydronic heating system: Many of the boilers are designed for light usage, and even the Hurricane boiler is perhaps on the fence. For the rest of the hydronic system on Viking Star I have chosen to use an residential / light industrial components. Example: 120v AC circulation pump and 24v remote valves as opposed to the typical 12v ones more commonly used on boats.
Oh, and one more thing: I actually violated a basic rule I have for backup components – I try (where possible) to purchase from a different supplier for my backups. We have one Xantrex inverter and the backup is an old Heart. Idea here is if there are any basic design issues which cause a failure, and identical backup will have the same fault.
Back to the Jabsco pump. I need to look around and see what else we can use; a quick Google search is not promising. Am thinking there might be a Paragon JR pump in the local 2nd hand store. If so, that might be the answer. Will see.