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Post by Andyberg on Nov 30, 2016 10:17:02 GMT
Currently running a bubble back boiler central heating system feeding 4 rads & colorifier with a thermostatically controlled pump( not continually running).
whats involved with adding an eberspacher or similar 3 rads down the circuit to run the existing radiator/ hot water circuit?
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Post by smileypete on Nov 30, 2016 10:59:14 GMT
Currently running a bubble back boiler central heating system feeding 4 rads & colorifier with a thermostatically controlled pump( not continually running). whats involved with adding an eberspacher or similar 3 rads down the circuit to run the existing radiator/ hot water circuit? If it's run like a 'ladder' with bubble at one end and eber at t'other, it may be hard to properly balance the rads for both heat sources, especially if long pipe runs are involved. I guess the eber will have higher output than the bubble and is fussy about under loading, so you could just balance the rads for the eber and tolerate possible lesser performance from distant rads when the bubble is running. Ideally you'd want both heat sources to feed the system at a common point. Either way you'd very likely need check valves to stop unwanted back flow through the unused heat source when the other heat source is running. |
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Post by Andyberg on Nov 30, 2016 11:06:09 GMT
I don't mean to have both systems running at once, the bubble takes quite a while to get going/ upto temp so am thinking the Eber could be used to give a quick couple of hours heat blast before bed or the like, only lighting the bubble when I'm on the boat for longer periods.
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Post by Deleted on Nov 30, 2016 11:31:38 GMT
Plate heat exchanger, circulating pump and a bypass valve would do the trick - thought needs to be given to ensuring a minimum amount of coolant for the eber to run correctly - a good sized exchanger and 22mm pipework along with a decent header tank with an in and out rather than just a teed stand off would help.
I'm about to carry out similar to my heating circuit.
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Post by smileypete on Nov 30, 2016 12:34:23 GMT
I don't mean to have both systems running at once, the bubble takes quite a while to get going/ upto temp so am thinking the Eber could be used to give a quick couple of hours heat blast before bed or the like, only lighting the bubble when I'm on the boat for longer periods. Gazzas post has reminded me of something... Is the existing install a Bubble oil stove with backboiler? If so then to paraphrase the instructions the system can only run pressurised IF a Toby valve with aquastat is used. Otherwise the system must run with an open header tank with feed and vent pipes, and with NO valves between backboiler and vent pipe. |
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Post by peterboat on Nov 30, 2016 13:00:47 GMT
You can because I have basically the same setup I did mine with a neatralising tank both the heat from the bubble and the slutter [whispergen in my case] heat water in the tank it is under my cauliflower so heats that by gravity however when the water in the tank is hot enough it pumps it around the rads by pump activated by thermo switch last boat had similar and this boat same in all 12 years of happy heating
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Post by Andyberg on Jan 22, 2017 14:52:32 GMT
Well completed the task of adding an additional boiler to my central heating system. Got a Webasto thermo-top setup from eBay with 12 months guarantee and did some chasing round for various other bits needed but overall well pleased with it and all in less than £500.
Fitted the Thermotop in my engine room connected to the 28mm copper via reducers and ball valves to isolate the webasto and a full flow 28mm ball valve to break the bubble stove circuit, the webasto passes water thro the bubble boiler and back round!
Can't believe how quick it warms up and how much cheaper it'll be than running my stove 24/7 ....impressed upto now, just need to add a rad into my front room at some time in summer.
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Post by smileypete on Jan 22, 2017 15:10:36 GMT
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