Keystoker KA6 60 Ft. From Oil Boiler

I am installing a Keystoker KA6in series with a 4 year old oil boiler. The KA6 will be about 60 Ft from the oil boiler 4 zone pumps are on the oil boiler and the inlet and outlet are 11/2" pipe do I need another bigger circulator between the two boilers?

What circulator do you have now??

Greg L

You need a circulator pump in the circuit between the coal and oil boiler. The size of the circulator pump you need will depend upon the size of pipe between the two boilers, the design temperature drop in your system, and the total heat load.

My coal and oil boiler are about 130 feet apart and I fire my oil boiler at 0.8 gal per hour so my max heat transfer requirement is about 90,000 BTU/hour. I use a Taco 007 pump in the circuit and 1" Pex al pex pipe (roughly the same size as 1.25" pex) and it has been very satisfactory.

I will be installing it soon and I am trying to size pipe and circulator to the oil boiler is 100.000 BTU fire @ 1gal/hour The KA6 has 1.5" fittings. Thanks for your help.

NO, if you are going to hook your coal boiler in series with your oil boiler you don't need another circulator.
just pipe your baseboard return into your KA6 and the output of the KA6 back to the oil boiler where the baseboard used to return to the boiler(your old circulator).

Now the K6 will sense the cold baseboard water faster and increase the coal fire faster and you don't need to mess with another circulator and your oil boiler will stay hotter and not want to turn on.

Do you need another pump? If your coal boiler with 1-1/2" tappings was right next to the existing boiler I would say no. But when you add the 60' supply, 60' return and the associated elbows and valves you will increase the piping resistance. Especially if you use less than 1-1/2 inch copper piping. The additional piping resistance will move the pump operating point and reduce the flow rate. Will it matter? Maybe not, but I'd plan for an additional pump in my piping layout. The additional pump would need to run whenever any of your existing pumps are running. Easily done if you have pump relays like the Honeywell R845. Have you had any problems with heat distribution in the zones, trapped air preventing flow, excessive water flow noise, using a lot of make up water? If yes now would be the time to make corrections.

Thanks for the info. The current 4 zones work well, no air etc.I have auto bleeds in the high spots I was planning to use 1.5" steel pipe for the run out and back. Should the circulator push or pull I was looking at a Taco 0010.