Mon, 25 May 2026 12:04:18 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19916#Comment_19916 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19916#Comment_19916 Sat, 03 May 2008 18:08:28 +0100 trigger trigger]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19928#Comment_19928 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19928#Comment_19928 Sat, 03 May 2008 20:59:56 +0100 Nickysells1 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19940#Comment_19940 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19940#Comment_19940 Sun, 04 May 2008 10:45:44 +0100 trigger https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19945#Comment_19945 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19945#Comment_19945 Sun, 04 May 2008 14:23:06 +0100 Dantenz https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19959#Comment_19959 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19959#Comment_19959 Sun, 04 May 2008 20:20:29 +0100 bobo I have just fitted a twin coil for someone but with solar and oil.
Standard cylinder coils are only tested to 3 bar but your PRV on the oil boiler will protect it.
Lots of these system boilers are now installed to give pressurised heating systems (with no tanks involved) and cylinder fed domestic water with a header tank.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19962#Comment_19962 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19962#Comment_19962 Sun, 04 May 2008 21:59:09 +0100 trigger https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19967#Comment_19967 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19967#Comment_19967 Sun, 04 May 2008 23:13:07 +0100 Cliff Greening You do need some help. I've only been in the Plumbing & Heating industry for 42 years, I was taught to wipe joints on lead pipe with pot and laddle and soil fuel was king. Its like riding a bike, you never forget and what you are trying to do is achievable. But before I can give you the answers you need I need some more information about just what you want to do.

1: What is the output of the wood burner?

2: Do you want to suppliment the whole central heating system and only let the oil boiler fire when you are out and cannot keep a fire in the wood burner, or the oil boiler to top up the wood burner in extreeme conditions?

3: Do you want the wood burner just to heat the cylinder to give you hot water?

4: When you say you have a pressurised system I take it you meant the heating system is a sealed system, no feed and expansion tank

5: Is the cylinder mains unvented as well or does it have a supply tank and just the heating side pressurised.

Once you give me the answers to the above I can tell you how to legally intergate the two heat sources.

As Dantenz rightly says a wood burner is can become an uncontrolable appliance and special measures need to be inplace, but again it can be done.

Regards Cliff ( The midnight plumber)]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19968#Comment_19968 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19968#Comment_19968 Sun, 04 May 2008 23:33:19 +0100 trigger Well what i have is a worcester bosch oil fired combi boiler , no header tanks, or hot water cylinder, unvented , fitted about 3 years ago, but with the ever increasing cost of oil and the opportunity to fit a wood burning stove which can run rads as well has intrigued me! i was looking at the charnwood 16b or similar which gives 7k to the room installed and feeds up to 10 rads.So yes would like to run on solid fuel with the oil as a back up, not so fussed about the hot water aspect more on heat to the place wher i live is north facing and very cold! You obviously are conversant with this , could you also tell me about this heat leak radiator cant seem to get a response on that. Thanks for your time midnight plumber!!!!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19971#Comment_19971 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=19971#Comment_19971 Mon, 05 May 2008 07:45:29 +0100 Dantenz https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20019#Comment_20019 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20019#Comment_20019 Mon, 05 May 2008 21:51:14 +0100 trigger https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20026#Comment_20026 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20026#Comment_20026 Tue, 06 May 2008 00:34:32 +0100 Cliff Greening In responce to your information my comments are as follows:-

Heat leak radiator. Solid fuel appliances should be installed with a minimum dia of 28mm Flow & Return gravity circuit to an indirect cylinder, if their is little or no demand for hot water the cylinder can overheat and start to boil, to prevent this from happening a towel rail or radiator connected across the flow and returns acts a heat leak. Its very crude but works, the heat leak can be manually closed to improve recovery on cylinder in times of high hot water demand.

Solid fuel appliances should never be connected to fully pumped systems or with zone valves unless they are the type that fail open.

How to sort out your little project? it can be done but you have keep the sealed system that is part of the heat slave separate from the open vented system that you have to form for the wood burner. You have to use a thermal store to link both heating appliances but keeping the water thats inside them separate. You could buy an off the shelf thermal store but they are expensive, you can make your own with a pre-insulated indirect cylinder suitable to work with 10 metre head and with a high recovery coil.

The cylinder/thermal store needs to be at least 1m above the wood burner, ideally at first floor level above the appliance, Flow and Return pipework from the wood burner need to be 28mm gravity, and no more than 10M away.

The possibilities are endless, I can and do have bespoke cylinders manufactured with 3 or 4 coils in to link in solar pre-heat and hot water. You could leave the oil boiler feeding part of your hot water system say shower and kitchen sink, but have a bath/ baths feed from the store, that way you reduce your dependancy on oil. The store needs to be fitted with a thermostat that will bring on the oil boiler to top it up as and when needed.

If you send me an email to warmwater@blueyonder.co.uk I will forward you a schematic drawing for the installation.

regards Cliff. The midnight Plumber.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20046#Comment_20046 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20046#Comment_20046 Tue, 06 May 2008 17:42:12 +0100 trigger https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20056#Comment_20056 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20056#Comment_20056 Tue, 06 May 2008 20:20:06 +0100 Dantenz https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20391#Comment_20391 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=1676&Focus=20391#Comment_20391 Sun, 11 May 2008 08:09:18 +0100 Cliff Greening