126 



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The Florists^ Review 



July 20, 1922 



house and connect it with two coils, 

 each containing four 1%-inch returns 

 running from eitlier side of the door in 

 the end of the liouse and along the side 

 walls back to the boiler end of the 

 house. Use a 2-inch pipe to connect each 

 of the coils with the main 2%-inch re- 

 turns. 



While a coal stove may be used for 

 heating a small greenhouse, it is not so 

 satisfactory as a hot water system. 

 The gas from the stove may kill the 

 plants. 



HEATING ADJOINING HOUSES, 



Each of my two greenhouses is 15x60 

 feet. Tlie houses are built side by side 

 and adjoining, as shown in the sketch 

 I have sent you. The side walls are four 

 feet high, of solid concrete; the ridge 

 is about nine feet from the ground. 

 The boiler room is at the north side, 

 and the greenhouses run north and 

 south. The temperature desired is 50 

 to 60 degrees, when the outside tempera- 

 ture is 10 degrees below zero. What size 

 of liot water boiler will be required to 

 heat the houses? Will you advise as 

 to the number of returns to use, the 

 arrangement of the piping, etc.? Is it 

 advisable to have the boiler in a pit 

 lower than the return pipes or is it well 

 to have the return pipes enter the 

 boiler on a level? II. J. S.— 111. 



To heat the two houses to 60 degrees, 

 a boiler rated at about 1,200 square feet 

 of radiation will be required. While it 

 will vary somewhat in boilers of dif- 

 ferent styles, this will generally mean 

 that the grate will l)c about twenty-six 

 inches in diameter. 



For radiation it would be advisable 

 to use two 2'4-incli flow pipes for each 

 house, placing one on each side wall 

 plate and giving it a fall of about one 

 inch in fifteen feet away from the 

 boiler. Each house will require seven 

 2-incli returns, of wliich four should be 

 in llie coil along tlie ex]>osed wall and 

 three on the opposite side of the house. 

 If rctui-u jiipes are desired under the 

 middle benches, use three 2-inch flows 

 and seven returns in each house, plac- 

 ing tlie third flow under the ridge and 

 using tliree relurns on the outside walls 

 :ind two in each of the other coils. 

 Connect the exjtansion tank with the 

 highest ]ioint in the main flow J'ipe. 



The boiler should be as much below 

 the returns as possible. While fairly 

 good results may be expected wlien the 

 lowest part of the returns is brought 

 l)ack to the boiler a foot or two above 

 the grate, it will be much better if the 

 returns are above the top of the boiler 

 and, if they cm be several feet higher, 

 the circulation will be all the better. 



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 The Peerless Glazing Point 

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 It. Order from yoar deal_j 

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 Write for samples 

 and price. 



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tl« Cksstaat VtrMtN 



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