96 



The Florists^ Review 



Sbftbubu 18. 1019. 



Greenhouse Heating 



BUBSCRIBESS are invited to write the 

 Editor of this Department with regard to 

 any details of greenhouse heating that 

 are not understood. When information 

 is desired regarding the capacity of boil- 

 ers, or the amount of radiation required 

 for a greenhouse, the needed temperatures 

 should be stated in the inquiry, as well 

 as the amount of glass in the side walls, 

 and the dimensions and general arrange- 

 ment of the greenhouses. It is of ten help- 

 ful, also, to have a sketch showing the 

 location of the houses. 



HEATING CANADIAN HOUSE. 



I am building a greenhouse, 16x50 

 feet, running north and south, with the 

 workroom at the north. The walls are 

 of 8-inch concrete, three feet high, with 

 twenty-eight inches of glass under the 

 eaves. The ridge is ten feet six inches 

 high and the glass at the south end is 

 above a 3-foot wall. What amount of 

 pipe would I require to heat the house 

 and how should it be distributed? I 

 have about 1,500 feet of li4-iuch pipe 

 and 200 to 300 feet of 1%-inch pipe on 

 hand. I intend putting the boiler un- 

 der the workroom at the north end and 

 can go down six or seven feet below the 

 ground. I should like to maintain 50 to 

 55 degrees of heat when the outside tem- 

 perature is 30 degrees below zero. Hot 

 water heat is to be used. 



W. A. L.— Can. 



Under the severe conditions men- 

 tioned considerably more radiation will 

 be required than in sections where zero 

 is a minimum temperature. We would 

 suggest the use of a boiler rated for 

 750 square feet of radiation, which will 

 require a grate about twenty-two inches 

 in diameter. 



As a rule, it is not advisable to use 

 1^4 -inch pipe in the returns for green- 

 house heating, but as the runs are short 

 and the boiler can be placed consider- 

 ably below the returns, we would favor 

 the use of the pipe since it is oh hand. 



Four runs of the 1%-inch pipe should 

 be used as flows, placing one on each 

 wall plate and the others near the pur- 

 lins. In addition to this, eighteen re- 

 turn lines of l^^-inch pipe will be 

 needed in the severest weather, while 

 fourteen will suffice in zero weather. 

 Place five returns under each side bench 

 and distribute the others under the mid- 

 dle bench and along the walks. 



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TO HEAT LETTUCE HOUSES. 



I have two connected lettuce houses, 

 each measuring 28x54; another house 

 28x104, and a lean-to 14x104, and am 

 building a house 28x170 at the east end 

 of the north house, which will prac- 

 tically be an extension. These houses 

 are fed by 5-inch mains, one supplying 

 the 104-foot houses, the other supplying 

 the 28x54-foot houses. Each house, ex- 

 cept the lean-to, has two 3-inch flows and 

 fourteen 2-inch returns. This gives suffi- 

 cient radiation. The easiest way that 

 I see to pipe the new house is to leave 

 the present piping as it is, run the 5- 

 inch main through the old house and 

 protect it with asbestos paper, and pipe 

 the new house much the same as the old 

 ones. The table I have says that a 

 5-inch main only supplies about 1,400 

 feet of radiation, while, if I have figured 

 it right, my 170-foot runs of 3V^-inch 



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WHEN YOU BUY-GET A KROESCHELL 

 **THE BOILER OF UNEQUALED FUEL ECONOMY" 



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KROESCHELL BOILERS give record 

 breaking services every winter 



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 AT ONCE 



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OUR EXPENSE 



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Neither in the East or West, nor the North or South has any othor 

 make of boiler ever equaled the performance of the Kroeschell— 

 installed for 3,974,605 square feet of class in 1916-1917. Every 

 customer immensely satisfied. The high efficiency and low cost of 

 operation make the Kroeschell the best of all boilers for Florists' use. 



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KROESCHELL BOILERS have satis- 

 factorily and permanently solved the 

 effective burning of screenings. They 

 will burn the worst grades of coal, even 

 the dirtiest culm or sawdust and wood 

 refuse. 



Greenhouse owners like the KROES- 

 CHELL because of its extreme simplic- 

 ity and freedom from trouble. As a fuel 

 saver, it pays its own way. The KROES- 

 CHELL will increase your heating plant 

 efficiency 20 to 40%. 



The KROESCHELL has proven its worth in many of the large establish- 

 ments in this country. It has frequently been selected by the most care- 

 ful buyers in competition with all other types of boilers. Its efficiency 

 and capacity are completely beyond any other boiler. 



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ORDER YOUR BOILER NOW 



Building has been suspended during the war, but it 

 will boom soon to make up for lost time. We 

 believe that building materials, INCLUDING 

 BOILERS, can be bought cheaper now than later, 

 after the building boom gets under way. 



' KROESCHELL BROS. CO., ^n'Tci^l^Sr' ', 



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