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Post by Deleted on Jul 31, 2018 15:06:06 GMT
My central heating is proper shit, its an aldi comfort 2928, big tall one. I swapped out all the rads this summer and replaced 80% of pipes as i though they might be shitted up, the top rad in the bedroom up at the bow takes hours to get hot,the bottom is hot and the pipework all the way round is hot, but it just seem to take forever for the heat to rise up the rad. I have bled and balanced but still shit, i do wonder if the silly little circulation pump in the bottle on the top the boiler is really up to the job, boat is 57ft so a long way for a little fan thing to push water, my thinking is that i should fit one of these.. shop.solarproject.co.uk/catalog/product_info.php?cPath=2&products_id=10&osCsid=6b808cda8fd6786eeb9a6912360f86e8But then which version, 6/8/11 litres per min, if it pumps to fast will it just circulate cold water, can the boiler keep up with the pump? I also have a hot water pump connected to the boiler that takes the water around the coil in the cauliflower tank, this works great and heats a full tank in 15/20 mins so i know the boiler is sound. Any thoughts?
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Post by Deleted on Jul 31, 2018 15:07:15 GMT
To add the first rad after the boiler, at the stern heats up fine, still slow, but does get hot at the top within half hour.
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Post by Telemachus on Jul 31, 2018 15:13:26 GMT
My central heating is proper shit, its an aldi comfort 2928, big tall one. I swapped out all the rads this summer and replaced 80% of pipes as i though they might be shitted up, the top rad in the bedroom up at the bow takes hours to get hot,the bottom is hot and the pipework all the way round is hot, but it just seem to take forever for the heat to rise up the rad. I have bled and balanced but still shit, i do wonder if the silly little circulation pump in the bottle on the top the boiler is really up to the job, boat is 57ft so a long way for a little fan thing to push water, my thinking is that i should fit one of these.. shop.solarproject.co.uk/catalog/product_info.php?cPath=2&products_id=10&osCsid=6b808cda8fd6786eeb9a6912360f86e8But then which version, 6/8/11 litres per min, if it pumps to fast will it just circulate cold water, can the boiler keep up with the pump? I also have a hot water pump connected to the boiler that takes the water around the coil in the cauliflower tank, this works great and heats a full tank in 15/20 mins so i know the boiler is sound. Any thoughts? If the bottom of the rad is hot and the top cold, this can only be explained by there being a lot of air in the top of the radiator! Or the radiator blocked up with gunge (but you said they are new). Hot water rises, given half a chance! yes the Alde built in pump is small but it does seem to work adequately if everything else is in order. If you are determined to fit an extra pump, the I’d go for the 8 l/min. I used the 6 l/min version for my engine to radiators heating system and it is just slightly on the slow side.
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Post by Telemachus on Jul 31, 2018 15:16:42 GMT
Perhaps you need to balance the radiators, ie close down the lockshield valves on the near ones a bit and make sure the distant one is fully open. I’d also get rid of any TRVs as they tend to restrict the flow a bit,
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Post by Deleted on Jul 31, 2018 15:21:03 GMT
Thing is when you fit new rads and pipework, bleed the friggin thing a million times and its still the same as before, you know something else is not working right, the pump all seems to be doing what it should, its just that top rad.
In my simple mind, faster flow means the water will rise faster.
No harm in trying i suppose.
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Post by Telemachus on Jul 31, 2018 15:26:22 GMT
Thing is when you fit new rads and pipework, bleed the friggin thing a million times and its still the same as before, you know something else is not working right, the pump all seems to be doing what it should, its just that top rad. In my simple mind, faster flow means the water will rise faster. No harm in trying i suppose. But as I said, if the bottom of the rad is hot and the top cold, it almost certainly needs bleeding. Could the pump be sucking air into the system perhaps? Also try shutting off the lockshields on everything except the distant radiator. If it doesn’t get hot then something is definitely wrong with the plumbing / bleeding. Maybe a blockage due to swarf or whatever in the rad? I think a new more powerful pump might disguise the issue a bit, but it won’t fix it!
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Post by Deleted on Jul 31, 2018 20:04:39 GMT
I've got an alde vertical boiler on one of my boats. Previous owner put a Bolin pump on it. Not sure if they still make them but I think there are some Chinese versions about.
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Post by brummieboy on Jul 31, 2018 20:06:10 GMT
Hot bottom but cold top means there is no water in the top of the radiator. As T/M says. Close all the other rads off, bleed the troublesome one. Can yiou backfill from another point such as a drain cock? You may have an airlock.
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Post by Deleted on Jul 31, 2018 20:57:23 GMT
Copied from the first post. Just for those who can’t read.
the top rad in the bedroom up at the bow takes hours to get hot,the bottom is hot and the pipework all the way round is hot, but it just seem to take forever for the heat to rise up the rad.
It gets hot, but takes ages, like two hours.
There is no trapped air as I have bled and balanced.
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Post by Deleted on Jul 31, 2018 21:09:09 GMT
Bigger pump ?
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Post by Telemachus on Jul 31, 2018 21:44:22 GMT
Copied from the first post. Just for those who can’t read. the top rad in the bedroom up at the bow takes hours to get hot,the bottom is hot and the pipework all the way round is hot, but it just seem to take forever for the heat to rise up the rad. It gets hot, but takes ages, like two hours. There is no trapped air as I have bled and balanced. You are confused somewhere. Unless you live in a parallel universe where the laws of physics are different? We can read, it is you who cannot receive a message not to your liking. Once again, If there is hot water getting into the bottom of the radiator it WILL rise straight to the top. Unless the top is full of air. Or the radiator is full of mud. Or sawdust. Do you actually mean that the bottom of the rad is hot, or do you just mean that the pipework near where it enters the rad is hot? If both pipes connecting to the rad are hot, the hot water is circulating through the bottom of the radiator. The hot water is not reaching the top of the radiator because it is full of air. Did I mention the air? Is it a double panel radiator? In which case you will find that each panel has a bleed screw and both panels have to have the air bled from them. Now get out of the Nile and open those air bleed valves. Make sure the reservoir /header tank is full first. Or maybe you live in Australia where the hot water rises to the bottom?
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Post by Deleted on Jul 31, 2018 21:50:11 GMT
The pump supplied with the alde boiler is a bit of a strange one. It looks like it is designed to just help a bit with a natural thermosyphon. My alde doesn't have the original in-tank pump but when I found a similar boiler by a bin I couldnt resist reverse engineering it for parts. I got the old type pump and the thermocouple off of it.
I feel that the inadequacy of the original pump could cause the issues described if the primary circuit consists of 15mm pipe.
Not sure if I can read but is this a new or preexisting problem?
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Post by peterboat on Jul 31, 2018 23:26:50 GMT
My old 60 foot narrowboat had an alde in it the pump was up to the job until the moment it failed!! Bought new pump problem fixed no issues with circulation whatsoever just the amount of gas it used
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Post by Deleted on Aug 1, 2018 7:08:11 GMT
Copied from the first post. Just for those who can’t read. the top rad in the bedroom up at the bow takes hours to get hot,the bottom is hot and the pipework all the way round is hot, but it just seem to take forever for the heat to rise up the rad. It gets hot, but takes ages, like two hours. There is no trapped air as I have bled and balanced. You are confused somewhere. Unless you live in a parallel universe where the laws of physics are different? We can read, it is you who cannot receive a message not to your liking. Once again, If there is hot water getting into the bottom of the radiator it WILL rise straight to the top. Unless the top is full of air. Or the radiator is full of mud. Or sawdust. Do you actually mean that the bottom of the rad is hot, or do you just mean that the pipework near where it enters the rad is hot? If both pipes connecting to the rad are hot, the hot water is circulating through the bottom of the radiator. The hot water is not reaching the top of the radiator because it is full of air. Did I mention the air? Is it a double panel radiator? In which case you will find that each panel has a bleed screw and both panels have to have the air bled from them. Now get out of the Nile and open those air bleed valves. Make sure the reservoir /header tank is full first. Or maybe you live in Australia where the hot water rises to the bottom? Once again, i have bled the rads, no air is present in them, the header tank is full, the bottom of the rad gets hot, the top takes a couple of hours to get hot. The rad is a double but has one bleed valve on the bar at the top that joins both panels. Once more, the rads have been bled and no air is in them, how do i know this, because i bled them and water came out the top of all the rads.... No air! Did i say no Air already?
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Post by Deleted on Aug 1, 2018 7:21:04 GMT
Might be an air lock somewhere I reckon.
Or possibly you need a bigger pump.
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