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Hi, here is all the information that I could find on this subject: Gravity fed systems for heating with a backboiler - the Intro section says enough that you can get a rough idea of what you must do (Added on the 18/09/2015) - Key principles is enough to get you started - and in Design there is more information for geeks who like to understand it all, or for people who need to debug I am designing a simple system which does not include a calorifier, so I have not included any information on this subject in this Summary. If you would like to add it, let me know and I will let you modify the text. There are still some questions that have not been answered. I have copied all of them here, below. If you have a short and clear answer to any of these questions, please post it here and I will add it to this summary. I might start discussion threads for some of these questions, if it turns out that the answer is complex and needs further discussion, or if no-one answers the question in the next few days. Important questions: Slope: - Why is the return pipe often straight-ish? Is the slope on the top pipe more important than the slope on the return? If yes, why? Pipes: - do you anneal copper pipes yourself, or do you buy them annealed? - could I use plastic hose to connect both the top pipe and return pipe to the radiators? That would save a lot of copper pipe bending. What would be the drawback, apart from appearance? The hose would have to tolerate boiling water temperature, too... Header tank: - is it a good/bad idea to have the top of the header tank outside of the boat? Radiators: - how can I know whether a radiator has a suitable bore, or whether it will cause too much friction? Coolant: - can you use tap water, or should you use distilled water? Why? Fiiling ratio: - how much water / coolant do you put in your system? (read the relevant part of the document, for more info) Geek questions: Thermostat: - is a thermostat only useful if you have a pump, or also for gravity-fed systems? (to prevent the water from flowing below 30C, for example) And where would you put it? On the return, on the top pipe, or on both? Pump: Apparently a centrifugal central heating pump would allow water to circulate via gravity when it's not running. Is that true? How would you choose such a pump? (how much power, etc) Anti-freeze: - Why do you need to premix anti-freeze and water before? (what difference does it make?) - How much anti-freeze do you put, with water? 50%? But Anti-freeze does not flow as well as water, and does not transfer heat as well, so less anti-freeze might be better? Is 30% alright in the winter? Pipe size: - Why do people recommend a 22mm pipe to the header tank, instead of a 28mm pipe which would make it easier for hot water to escape? - Is it better to have 28 to 15mm adapters on the rads, or to have 15mm pipes Tee-ing to the rads? The second options enables to have a tighter bend, which causes friction, but enables the radiators to be higher. Misc: - SmileyPete said this in an old post, and I don't understand the word "lagged" in this context, any idea? Here is the text: "a good way of doing it is to have an adequately sized gravity 'heat dump' rad(s) near or next to the stove, then more distant rads and/or calorifier on a pumped circuit connected by 15mm pipes, ideally lagged. That way the gravity rads can be shut off and all the heat directed to the furthest rad." ------------ I wrote this by reading, organizing and summing up all of the relevant information discussions threads that are mentioned in the Index of common topics on this forum, plus a few other sources of information on internet.
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Hi all 👋, first post on here but probably one of many, I'm currently looking into the heating system I am going to install on my widebeam i was hoping you could take a look and tell me what you think and if it all looks ok. (Heating sorce: Solid fuel fire and diesel water heater Heating up - radiators, under floor heating and hot water) I am thinking of installing the bubble b1c1 corner stove with back boiler, also what are peoples thoughts on the Prity AM 12 ( https://fireplacesforhome.com/Wood-Burning-Stove-Corner-Model-Fireplace-Log-Burner-Solid-Fuel-Prity-AM-12kw ) multifuel stove? And also a webasto diesel water heater. All my heating appliances are going to run to the NRG zone 5 manifold wich does allow thermosyphon , I plan to have 4x radiators, underfloor heating and calorifier attached. The diagram is missing the PRV and the pipes from the back boiler to the heating manifold will be in 28mm. My biggest worry is the thermosyphon safety as it is going to run to the heating manifold so i dont have any heat leak. Any input would be appreciated. Kind regards Brad I've linked the NRG zone let me know what you think to using this as I can't see any post speaking about this or any manifold. https://www.nrgawareness.com/product/nrg-zone-4-5-6-32-32-28/
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- back boiler
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From the album: Petes
Heating layout for boats combining gravity and pumped radiators plus a gas or diesel heater.-
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Hi, can anybody tell me whether it is possible to replace a macerator toilet with a gravity pump lever type? We had to take the old macerator toilet out (broken an unable to repair). We currently have a porta potti in place but would like a more permanent replacement. Has anyone done anything similar?
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Plan installing Squirrel with back boiler on daughters boat. Very familiar with domestic and industrial pumped systems but new to gravity so likely to have many questions as the design progresses! Boat is 57 foot with boiler position at one end and calorifier other end, low in engine bay, and accept if I link calorifier in, I may have to pump that leg. A few questions for now: 1) Are there any typical installation diagrams available to view on the web? 2) old boiler had back flue outlet leaving plenty of space for pots on stove. If rear outlet is an option on Squirrel with back boiler, can I simply fit a 90 degree bend to vertical flue (can then also use existing ceiling hole and registration plate area)? 3) Where should the open expansion tank best tee into the system, and ideally keep itself cool to miniseries condensation from any evaporation? 4) Best place to buy a new Squirrel and back boiler (best deal price)? Thanks
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Dear Friends, I am creating a gravity fed heat sink for my new stove back boiler. Thanks to help on this site, I have ironed out many of the questions I needed answer to. However one still remains. For the heat sink aspect of a gravity fed system, would a 10 - 12 meters of 22mm cooper pipe made into a sort of towel rail allow water to thermosyphon. Would be using a pipe bender not joints to keep joint restrictions at near zero. There would be a lot of horizontal pipes in this design idea, which is a concern, I don't have enough experience to know if gravity circulation would function enough under these conditions. Would use mounts all the way along to support the pipe. Haven't done the maths yet, in terms of how much heat would be displaced, but will get back to that after, once I know this design will work. Please enjoy my wonderful diagram which hopefully will assist the explanation :-)
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- gravity
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