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randyb

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Any experience here with individual wall mounted radiators ? Maybe made from used a/c condenser's. My idea is to run the hot water pipes to heat exchanger radiators in each room with small forced air fan. My reasoning is I can build this system cheaper than radiant concrete floor and the heat would be more immediate. I like the idea of being able to control heat in each room. Plus I'm not crazy about the idea of hot floors. I am kind of hot natured and would hate to waste my money on a floor system I hated. 

Bert

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I have no experience doing that myself but what about radiant heat registers like this?
[HBComplete2] 
Don't know if you would need a fan. You could build an enclosure with fans and elements inside I suppose or just place fans behind it.
They show how to make nice looking enclosures online. YouTube probably.

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stmbtwle

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Reply with quote  #3 
I think they might work well and would be quieter than what I built, which we use every winter. It's a lot easier to punch a small hole through a concrete wall for pipe tham a much larger one for air ducts. Here's mine.

https://simplysolar.supporttopics.com/post/willies-solar-hot-water-space-heater-7257880?highlight=space+heater&trail=10

We run ours for a couple hours every morning to heat our "sun room". Once the sun is up, then the room itself becomes a collector and we turn the fan coil off.

My system is nowhere near big enough to heat a house.

You might also consider a "kick space heater" which apparently can be wall mounted in an enclosure. http://www.supplyhouse.com/Beacon-Morris-K42-K42-Kick-Space-Heater-4770000-p

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Willie, Tampa Bay
gbwillson

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Reply with quote  #4 
Used baseboard water heaters, like the one Bert's photo shows, can often be found for free or very cheap. They don't bring the scrappers nearly as much $$$ as the heavy radiator-type heaters. And nothing says you can't "stack" them up a wall if you need more heat.

Greg in MN
stmbtwle

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Reply with quote  #5 
Very true. I looked one up and even new they're cheaper than a fan coil and they would be even quieter. Finding a used one around here would be an exercise in futility, though. Everyone uses heat pumps.

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Willie, Tampa Bay
randyb

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Reply with quote  #6 
Quote:
Originally Posted by stmbtwle
I think they might work well and would be quieter than what I built, which we use every winter. It's a lot easier to punch a small hole through a concrete wall for pipe tham a much larger one for air ducts. Here's mine. https://simplysolar.supporttopics.com/post/willies-solar-hot-water-space-heater-7257880?highlight=space+heater&trail=10 We run ours for a couple hours every morning to heat our "sun room". Once the sun is up, then the room itself becomes a collector and we turn the fan coil off. My system is nowhere near big enough to heat a house. You might also consider a "kick space heater" which apparently can be wall mounted in an enclosure. http://www.supplyhouse.com/Beacon-Morris-K42-K42-Kick-Space-Heater-4770000-p



I looked at your referenced post and yes that is similar to my ideas. I would probably go with something smaller since my idea would be to put in each room rather than the normal addition to the central ac duct. My reasoning is that it would extend the life of the captured hot water. No need to heat a room if there is no traffic there at a given time. I need to do some calculating/estimating (calcumalating [smile] as to the size of collector and reservoir needed. The house will be about 1600 sq ft. I live in an area that has little snow and light to medium winters. The house I plan to build will be extremely well insulated and sealed with tall ceilings to help dissipate heat in the hot summers here. So the idea of mounting the heaters high would help circulate the heat as it rises. I am also contemplating doing the solar air heat for those sunny days. The radiator heat will be used when that is not available. I also plan to used the same reservoir and collector for enough hot water for 2 people.  My questions are; how do these hot water space heaters compare to radiant floor heat in efficiency. In my mind I am thinking they would be more efficient since radiant heat under a wood floor has to penetrate the insulating factor of the wood and the heat in a concrete floor has to penetrate through the concrete before see's any efficiency. and either floor would need to be on at all times or else it would take several hours to get the room up to a comfortable temperature. Whereas hot water through a radiator with small forced air fan would be immediate heat and not need to be on at all times when the room is not in use. I also believe this method to be much cheaper to install considering it would not require all the under floor insulation and piping. What am I missing here ? Am I thinking correctly ?
randyb

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Reply with quote  #7 
Quote:
Originally Posted by gbwillson
Used baseboard water heaters, like the one Bert's photo shows, can often be found for free or very cheap. They don't bring the scrappers nearly as much $$$ as the heavy radiator-type heaters. And nothing says you can't "stack" them up a wall if you need more heat.

Greg in MN


I've never seen any of those in use here. I have had electric baseboard non air circulating heaters like that though. Without an internal fan to circulate the air they did not do as good of a job as the little ceramic heaters I've had. I did google those though and it also brought up some forced air square wall or ceiling hanging types too but they are much more expensive than the baseboard type. The smaller ones dimensions we're about the size as a homemade auto heater core type would be and around $130. And the larger went way up from there.
I'm planning on a small solar power system too so I think i can build them for a lot less and use small 12v fans, slightly larger than a pc cooling fan, to circulate.  Don't think it would take much air flow to circulate the heat. A variable speed may be more efficient controlled by a wall thermostat. I have access to a bunch of used auto a/c blower motors and radiator fan motors for free so I might save some of those to experiment with. Also have access to a bunch of auto radiators and heater cores that might work but I am leary of going used because of possible leaks. 
The heaters themselves will be no problem. My main concern is efficiency as compared to a radiant floor. 


dadesantis

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Reply with quote  #8 
I used 1/2" copper and Pex with Aluminum fins around my bedroom baseboard and have a ceiling fan. No issues and it works great.

I use 120 'F water but your idea should work.

I have tha same thing on the ceiling in the living room.

Consistent temperature and air circulation are necessary for efficiency.

A gas water heater holds water to polish solar and a temp switch turns the pumps on when needed.

My ceiling fan is on when I am home or only when needed.

Good luck!
gbwillson

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Reply with quote  #9 
Near the bottom of this page there are several examples of hydronic walls.

http://www.builditsolar.com/Projects/SpaceHeating/Space_Heating.htm

Greg in MN
randyb

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Reply with quote  #10 
Quote:
Originally Posted by dadesantis
I used 1/2" copper and Pex with Aluminum fins around my bedroom baseboard and have a ceiling fan. No issues and it works great. I use 120 'F water but your idea should work. I have tha same thing on the ceiling in the living room. Consistent temperature and air circulation are necessary for efficiency. A gas water heater holds water to polish solar and a temp switch turns the pumps on when needed. My ceiling fan is on when I am home or only when needed. Good luck!



Do you have a large reservoir ? How many hours do you get from your system ? 
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