18 posts • Page **1** of **2** • **1**, 2

I am building a coal fired pool heater. I have the heat exchanger and the shaker grate built. Hopefully this weekend I will get the refractory cement in the fire chamber. Then I have to build the base with the ash pan and blower. I will post picks as soon as it is finished. I tested the heat exchanger with wood and it worked good but adding wood every 15 min gets old fast not to mention the creasote build up on the exchanger. The heat exchanger is made from 11 runs of 5/16 copper tubing connected to 1 inch copper manifolds.

- blue83camaro
**Stove/Furnace Make:**Us Stove**Stove/Furnace Model:**1600G

a few pics of my progress. The fire chamber is one you are looking down into at the shaker grates. It will have a 1.5 inch thick cast refractory wall. The can below will hold the ashes and the blower. On top of the fire chamber will sit another can containing the heat exchanger but it will only be about 8 inches tall. I will refine the whole system if it works good.

- Attachments

- blue83camaro
**Stove/Furnace Make:**Us Stove**Stove/Furnace Model:**1600G

I have been reading about and researching coal-fired water heaters for my pool.

Here's a good link, albeit wood-fired, but the site gives some useful information.

http://www.woodstovepools.com/WSP-PROFILE.html

Here's a good link, albeit wood-fired, but the site gives some useful information.

http://www.woodstovepools.com/WSP-PROFILE.html

- EarthWindandFire
**Hot Air Coal Stoker Furnace:**Leisure Line Lil' Heater.**Other Heating:**Oil Furnace and Kerosene Heaters.

How about a Stoker Pool heater for us "girly" aka older coal burners. Just remember we have been there and done that and maybe "Earned" the stoker right for our older coal burning bones

- 2001Sierra
**Hot Air Coal Stoker Stove:**Keystoker 90 Chimney vent**Coal Size/Type:**Rice**Other Heating:**Buderus Oil Boiler 3115-34**Stove/Furnace Model:**Keystoker 90 Chimney Vent

My EFM is heating the pool right now...80 degrees currently.

- Rob R.
**Stoker Coal Boiler:**EFM DF520**Hand Fed Coal Stove:**Hitzer 50-93**Coal Size/Type:**Lehigh Rice**Other Heating:**Dad's 1953 EFM Highboy

80 degrees???? are you takin a bath or swimmin---the old swimming hole down at the creek is about 60*--I think my willy got sucked up towards my adams

- freetown fred
**Hand Fed Coal Stove:**HITZER 50-93**Coal Size/Type:**BLASCHAK Nut

I would never, ever, use a wood-fired pool heater!

I guess I posted the wood-fired heater link as an example of what could be made using a coal-fired stoker.

I guess I posted the wood-fired heater link as an example of what could be made using a coal-fired stoker.

- EarthWindandFire
**Hot Air Coal Stoker Furnace:**Leisure Line Lil' Heater.**Other Heating:**Oil Furnace and Kerosene Heaters.

I am posting this for future reference:

The goal is to have a heater that has enough capacity to heat the pool to your desired level in a reasonable amount of time. Maintaining that temperature is a lot easier once the pool is up to temp.

First, the capacity of most pool heaters are rated in BTU's or British Thermal Units. One BTU is the amount of heat required to raise the temperature of one pound of water, one degree F. And since there are 8.33 gallons of water per pound, it takes 8.33 BTU's to raise one gallon of water, one degree F.

Now let's calculate:

1. Determine the number of gallons in your pool (G).

2. Determine the amount in temperature that you want to raise the pool temp (the easiest way to figure this is to use the air temp as the minimum and the desired pool temp as the maximum) (Delta T).

3. Calculate the number of BTU's needed (BTU) per gallon of water by multiplying step 2 x 8.33. Multiply this number times the gallons of water in your pool (G). This is the number of BTU's to raise your pool temp from the minimum to desired temp.

4. Determine how FAST you want to be able to go from the minimum temp to the desired temp (in hours) (H).

5. Divide the total number of BTU's from step 3 by the hours in step 4 to yield the BTU's per hour that your heater will need to deliver.

6. Multiply Step 5 by a error factor of 20% and add to step 5. This is approximately the size of heater that you will need.

Example:

1. Assume pool volume, G = 10,000 gallons 2. Assume 80F desired pool temp and 60F air temp. Delta T = 80 - 60 = 20F 3. BTU's per gallon x Delta T: 8.33 x 20 = 166.6 BTU's per gallon. BTU/Gal x Gallons (G): 166.6 x 10,000 gal = 1,666,000 Total BTU's. (Wow, seems like a lot!) 4. Assume I want to be able to warm the pool in two days of continuous operation = 48 hours. 5. Total BTUs / Hours: 1,666,000 / 48 = 34,708 BTU's per hour. 6. (BTU/Hr x 20%) + BTU/Hr: 34,708 x 0.20 = 6,941 BTU's 6,941 + 34,708 = 41,649 BTU's per hour.

Now, most pool heaters come in a round number of BTU's like 50,000, 100,000, 150,000, etc. You should select the closest size to your needs (usually on the higher side is best).

Hence, for this example, a 50,000 BTU heater would be more than adequate.

Obviously, you could also work these calculations backward to determine what Delta T you could handle given a certain size heater and pool size.

The goal is to have a heater that has enough capacity to heat the pool to your desired level in a reasonable amount of time. Maintaining that temperature is a lot easier once the pool is up to temp.

First, the capacity of most pool heaters are rated in BTU's or British Thermal Units. One BTU is the amount of heat required to raise the temperature of one pound of water, one degree F. And since there are 8.33 gallons of water per pound, it takes 8.33 BTU's to raise one gallon of water, one degree F.

Now let's calculate:

1. Determine the number of gallons in your pool (G).

2. Determine the amount in temperature that you want to raise the pool temp (the easiest way to figure this is to use the air temp as the minimum and the desired pool temp as the maximum) (Delta T).

3. Calculate the number of BTU's needed (BTU) per gallon of water by multiplying step 2 x 8.33. Multiply this number times the gallons of water in your pool (G). This is the number of BTU's to raise your pool temp from the minimum to desired temp.

4. Determine how FAST you want to be able to go from the minimum temp to the desired temp (in hours) (H).

5. Divide the total number of BTU's from step 3 by the hours in step 4 to yield the BTU's per hour that your heater will need to deliver.

6. Multiply Step 5 by a error factor of 20% and add to step 5. This is approximately the size of heater that you will need.

Example:

1. Assume pool volume, G = 10,000 gallons 2. Assume 80F desired pool temp and 60F air temp. Delta T = 80 - 60 = 20F 3. BTU's per gallon x Delta T: 8.33 x 20 = 166.6 BTU's per gallon. BTU/Gal x Gallons (G): 166.6 x 10,000 gal = 1,666,000 Total BTU's. (Wow, seems like a lot!) 4. Assume I want to be able to warm the pool in two days of continuous operation = 48 hours. 5. Total BTUs / Hours: 1,666,000 / 48 = 34,708 BTU's per hour. 6. (BTU/Hr x 20%) + BTU/Hr: 34,708 x 0.20 = 6,941 BTU's 6,941 + 34,708 = 41,649 BTU's per hour.

Now, most pool heaters come in a round number of BTU's like 50,000, 100,000, 150,000, etc. You should select the closest size to your needs (usually on the higher side is best).

Hence, for this example, a 50,000 BTU heater would be more than adequate.

Obviously, you could also work these calculations backward to determine what Delta T you could handle given a certain size heater and pool size.

- EarthWindandFire
**Hot Air Coal Stoker Furnace:**Leisure Line Lil' Heater.**Other Heating:**Oil Furnace and Kerosene Heaters.

Don't you know the easiest way to heat the pool is go to your local jenny craig and post a pool party poster, when they arive dump a box of twinkies in the pool and all that excess blubber will warm the pool in no time flat.

- AA130FIREMAN
**Stove/Furnace Make:**axeman anderson**Stove/Furnace Model:**130 anthratube

That might work, but the pool would be half empty when they all got out.

- Rob R.
**Stoker Coal Boiler:**EFM DF520**Hand Fed Coal Stove:**Hitzer 50-93**Coal Size/Type:**Lehigh Rice**Other Heating:**Dad's 1953 EFM Highboy

If I had a dedicated boiler for just heating the pool, would any boiler work well or the smaller the better?

And, being the summertime, a boiler would have a hard time staying lit in summer temps.

The load would be 35,000 to 50,000 BTU's at most. Any boilers that small or would another method work better?

This would also be a chlorine free pool using an ozone generator instead of the harsh chlorine.

And, being the summertime, a boiler would have a hard time staying lit in summer temps.

The load would be 35,000 to 50,000 BTU's at most. Any boilers that small or would another method work better?

This would also be a chlorine free pool using an ozone generator instead of the harsh chlorine.

- EarthWindandFire
**Hot Air Coal Stoker Furnace:**Leisure Line Lil' Heater.**Other Heating:**Oil Furnace and Kerosene Heaters.

EarthWindandFire wrote:This would also be a chlorine free pool using an ozone generator instead of the harsh chlorine.

Ozone is corrosive too.

- coaledsweat
**Stoker Coal Boiler:**Axeman Anderson 260M**Coal Size/Type:**Pea

I used my AA and a SS heat exchanger. Was the best week we've spent in the pool last summer. Haven't gotten around to plumbing it again this year, just not enough time.

- cabinover
**Stoker Coal Boiler:**Hybrid Axeman Anderson 130**Baseburners & Antiques:**Sparkle #12**Coal Size/Type:**Pea, Buckwheat, Nut**Other Heating:**LP Hot air. WA TX for coal use.

C'mon Bob! No midnight swims for you!

- Scottscoaled
**Stoker Coal Boiler:**EFM 520, 700, Van Wert 800 GJ 61,53**Baseburners & Antiques:**Magic Stewart 16, times 2!**Coal Size/Type:**Lots of buck**Other Heating:**Slant Fin electric boiler backup

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