will this work ?

Rich P

I have a total electric home and a 3.ton heat pump with 12.5 k. w. aux .heat. I want to install a wall hung tankless boiler, cartridge circ.,and,hot water coil in the air handler as my primary source of heat.My theroy is my 20 year old pump is on her last leg and aux. heat is always running any way to keep up with demand.Our winters here in central jersey seem to be getting colder or I'm just getting older!. I want to try this using my exsisting ahu and if it works , then I'll put a standard ahu and 3ton condensing unit.I need advice on equipment selection and how to size the hot water coil.Also, I dont want to go oil or propane due to tank placement restrictions in my community.Does any one think I'll save money on electric this way or shoud I just replace the heat pump?. Thanks,cold and broke in N.J.

Al Letellier

hvac upgrade

Sure makes sense to me. We have done this type of conversion before. First Company makes good Air handler for both heat and cooling. that new boiler can also make a lot of domestic hot water with an indirect attached. Electric heat is near 100% efficient, but you pay dearly for it. Make the switch.

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don_88

Bad Ideal

Why not get a new heatpump with a higher cop,will save far more money going that route then you would with a electric
boiler.

1kw input of a resistance heater produces 3.413 btus.

1 kw input of a heatpump operating at a cop of 2.5 produces
approximately 8,533 btus.

Using newer units with higher COPs will result in much greater savings.

Rich P

Hey, Anyone else have some isight here? we have one yeah and one ney. Come on folks ,need some more input!!!!

Ken_8

Heat pumps in NJ are like

snow balls in Miami.

There's not enough energy in the air here in winters to make the heat function properly. You'll be on resistive 11-13 cents a KW wire heaters much of winter.

Hydro-air has huge potential. Heat pumps are decent at cooling, not real good at heating when outdoor temps drop below 35°

Do the hydro-air thingy, include an indirect and you'll never regret it.

Promise!

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STEVE N

Rich....

I am not a huge fan of electric boilers or heat pumps for that matter. However in your case a hydro air system would be your best choice by far. Weil Mclain makes 2 electric boilers models CER and P-ER. I would recommend checking out WMs site and look at their hot water coils as well. You have to be careful sizing the coil making sure you get the right coil for the CFMs of the AHU. Staging would be the way to go. Use the heat pump at moderate temps and use hydro air as your second stage. If you are going to up grade your equipment consider 14 or 16 SEER and possibly a varible speed AHU.

Thats my 2 cents.... good luck

Steve

don_90

Well Rich

as you can see,you will get many opinion has to which is best.I personally have a open mind when it comes to all forms of heat.

What is electrical resistance? Its a means of converting electrical energy directly to heat.

A heatpump uses electrical energy to simply move heat and the result is that an average of two to three times as much
heat can be moved for each kilowatt of input compared to that produced by the use of straight resistance heating.

So even if at 35 degree your heatpump began to bring on the
resistance heat to help out,because it has reach it balance point,it just goes to show that it will use less kw then that electric boiler.

Free your mind !!!

Rich P

Thanks to everyone for thier input. I've worked in this field for 28 years mostly comm./ind. and dont have to many to reach out to. I'ts nice to know there is a place to come when you need to. Great site ,!!!!!.