Hi, Our contractor will be installing a 4 ton Envision Waterfurnace. We have limited space in our front yard so we said we would be fine with 2 vertical loops going deeper down. I can't remember exactly how far. Is there any problem with this. If we did more loops we would have the space but would have to trim some trees or maybe take one down. Anything to worry about? Thanks!

Deeper loops need larger diameter pipe. Can work fine as long proper design is followed.

I have a 3-ton WF Envision on a single 450-foot vertical bore
(plus a 50' trench to the house). Our contractor gave us the
choice of that or a pair of 225-foot bores. We went with the
single bore to avoid "collateral damage" to old plantings.

In hindsight, that was the right choice. It simplified the loop
by eliminating manifolds and minimizing underground joints.
We did have to go to 1.25" pipe to keep pumping losses low
enough for a single UP26-99 circ pump.

Just finished our 3rd PA winter with everything A-OK.

...less is more,

Looby

It is all a function of the design= feet of pipe underground. As long as the length of total pipe is not shortened your machine will never know if it has 1 really deep loop or 4 shorter ones.
Eric

If a deeper loop has a greater percentage of its length below the water table, that will significantly enhance performance.

I think below 500 ft you become a mining operation and will need a mining license. We usually go down to 400 -500ft/borehole. You will need larger pipe, 1" or 1.25", so apressure drop calculation is warranted.

Posted By Alton on 22 Mar 2012 08:22 PM
Will a deep well that equals two shallow wells require more pumping power?

It ain't the depth, it's the geometry/topology. Two short loops
of pipe connected in series are no different than a single loop
of twice the length. However, if you connect the short loops
in parallel, it's an entirely different situation -- requiring less
pumping power for a given pipe diameter (and a given GPM).

It doesn't matter in the least whether the pipes are vertical or
horizontal.

Looby

YES- WET BOREHOLE CONTACT IS SUPERIOR
DRY SHALE UP HERE REQUIRES ~`15% MORE FOR SIMILAR PERFORMANCE TO WHEN WATER IS 35 FT FROM GRADE IN BOREHPOLE

1-PUMP CAN HANDLE IF A LOW PRESSURE-DROP UNIT hx IS IN ON ALSO 2) PARALLEL LOOPS IN TO 1 FOR 4 TON USUALLY ARE 1" X 360 MAX SDR-11, THOUGH FOR 720 FT Max WITH PIPING PRESSURE DROPS AND 18-20% ANTIFREEZE 
AND is A MINIMUM FOR A 3.1/2 TON COMPRESSOR WITH DESUPERHEATER LITTLE HW GENERATOR  if IN A "SIZE 4" RATED UNIT. 

ASK IF THE HOUSE IS A 5-TON LOAD AND SEE THEN IF YOU NEED 2) 485 X 1.1/4" ON AN 1.1/2" HEADER PIPING AND 2) PUMPS

 IF IN 52 DEG NORTHERN ECL (gle) TEMPS:  These are our minimums for a performance 34+deg.f loop on a 4-ton load of the building

seen the series loop all 1.1/4" work but not as 3%-6% efficiently warm as 2 parallel.

JP

One circulation pump (26-99) can also work in a 5 ton unit if loopfield design and pressure drop calculation are done appropriate. Too many people follow rule of thumbs. No need to design for 34F minimum EWT, especially with expensive drilling. 30F is plenty, will cost you may be 30-50$/year to operate, but can save you thousands of $$$ upfront.