Q. I find it necessary to run three distinct riser-pipes from kitchen-boiler to the second and third floors. Can I secure a circulation by running a single return-pipe having branches connecting with each riser above the highest fixture? Would more return-pipes be any better?

A. Bring the branches E and F into the return D at slightly different levels to prevent the circulation in one meeting and checking that in the other, as they would do to some extent, certainly, if connected as shown. At the junction of G and D let G turn downward, so that the circulation in D may not be, in part, diverted into G, to prevent a circulation in the latter pipe. Then with a return-pipe large enough to carry the circulation in the three hot-water pipes you should get a circulation. We would advise that you make the pipes from boiler to junction a size larger than the pipe A, otherwise there is risk that the greater part of the circulation will take the easiest course through A, as that is in direct line, giving you little or no movement in B and C. If you intend to use iron pipe, Y-branches or "division-tees" (Figure 37, Hunter, Keller & Co.'s Catalogue) will give better results than plain tees.

If the work is to be lead pipe, the good judgment of the plumber must be exercised in making easily-flowing joints, which direct the water in the proper direction.