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Old 01-28-2010, 05:50 PM
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Default Hot Water Baseboard Thermostat

I want to put in a new programmable thermostat for my HW baseboard heater. I'm not sure why you need a different stat for a HW system verses a single stage furnace... but apparently you do. My boiler is a 30 year old (I think) Weil-McLain electric boiler. Seems to work fine.

I'm looking at this stat...

http://www.pexsupply.com/Honeywell-A...ing-Thermostat.

I'm pretty sure it'll work... but could someone verify/

Thanks
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Old 01-28-2010, 06:37 PM
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It will work. On a forced hotwater system you'll only have 2 wires feeding your thermostat. Easy install. They do save money.
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Old 01-28-2010, 06:53 PM
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Every programmable thermostat I've seen comes set for warm air furnaces. Keep this in mind when you are installing your new thermostat. If you neglect to change the factory settings, the boiler will short cycle and end up causing problems in the long run (not to mention your fuel consumption may actually increase). I prefer the Honeywell line, we install the Vision Pro 8000 often, great product that works well.

Although Weil McLain did make an electric boiler for a short time, I have never seen one here in NJ or NY. I suspect your boiler may be gas fired with an electronic ignition?
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Old 01-29-2010, 04:11 AM
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Quote:
Originally Posted by Tuna Man View Post

Although Weil McLain did make an electric boiler for a short time, I have never seen one here in NJ or NY. I suspect your boiler may be gas fired with an electronic ignition?
Nope... straight electric. Looks just like this...

http://www.weil-mclain.com/en/multim.../permanual.pdf

Like i mentioned, it seems to work just fine. I have a propane furnace that heats the first floor... the boiler does the hydronic on the 2nd floor. I know it's expensive to operate, it draws 138a. So i was thinking of replacing it, but I'm pretty sure that I'm going to install a solar array this summer, so keeping the electric heat kinda makes sense over installing a propane boiler.

Thanks to both of you for the info. I'll check out the Honeywell VP 8000 vs. the one I linked in the OP.

Tim
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Old 01-29-2010, 04:28 AM
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Any thermostat will work with a simple boiler. As mentioned above, you only use 2 of the wires. Just program the thermostat how you want it and leave the "Fan" switch on Auto.

I have 2 Honeywell and 1 ritetemp programmable thermostats for the 3 zones in my house.
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Old 01-29-2010, 12:06 PM
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Originally Posted by timo14 View Post
Nope... straight electric.

but I'm pretty sure that I'm going to install a solar array this summer, so keeping the electric heat kinda makes sense over installing a propane boiler.

This solar array that is going to power that 100+ amp boiler, how many acres/square miles is it going to cover?????
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Old 01-29-2010, 12:27 PM
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This solar array that is going to power that 100+ amp boiler, how many acres/square miles is it going to cover?????
Why does there always have to be a smart-ass reply?

You obviously dont know how a solar system works. It doesn't "power" any specific item directly, otherwise night time would be very dark. I'll have the ability to generate electricity and dump it into the grid. Thereby I'd reduce my bill in the winter and summer, and have a negative bill in the spring & fall. I'll never be able to generate propane, so I'd always be paying for that outright.

Solar array will probably be 12kW.
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Old 01-30-2010, 11:35 AM
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Quote:
Originally Posted by timo14 View Post
Why does there always have to be a smart-ass reply?

You obviously dont know how a solar system works. It doesn't "power" any specific item directly, otherwise night time would be very dark. I'll have the ability to generate electricity and dump it into the grid. Thereby I'd reduce my bill in the winter and summer, and have a negative bill in the spring & fall. I'll never be able to generate propane, so I'd always be paying for that outright.

Solar array will probably be 12kW.

Actually I do know how solar systems work. I also know who benefits the most, the dealer/installer. You will not live long enough to reach the break even point considering upfront cost, repairs, battery replacement (they don't last forever). Here's a response I found in a quick search, similar situation as yours.


Honestly it is not really possible to run a hot water tank off of PV solar, it takes way too much energy to ever be feasible and environmentally ill responsible to do so.

A hot water tank depending on size has a heating element from 3 KW to 12 KW. Your common 40 gallon electric hot water tank heater element is 5500 watts. Most solar inverters used in homes are 3 to 5 KW, so those are not even large enough to supply a electric hot water heater tank, let alone anything else. Of course you can buy a large enough inverter but who in their right mind is going to pay $10K to buy an inverter for a hot water heater.

Also the panels would cost you a small fortune to run a hot water heater. Hard to say exactly what size in wattage you would need because no one knows exactly how much hot water you use, efficiency of your heater, and the condition of your plumbing. But if you use national average figure for hot water consumption of 63 gallons of hot water per day comes out to about 14 to 16 kilo-watt hours per 24 hour period. So depending on where you live in the country that would require that would require PV panel wattage of 12 kilo-watts or about $50K to $60K just in panel cost alone not even factoring in installation and material cost. Keep in mind most home PV systems are 3 KW

Batteries, well there is another big sticker shock. To supply 14 to 16 KW per day in battery power would be around 6000 Amp hours in battery capacity. Another $40K of expense plus a additional room about the size of your living room to house that many batteries, and a ton building, EPA, and fire code requirements/permits. Oh yeah, you have to replace those batteries every 5 to 7 years. OUCH! More EPA permits and disposal of toxic chemicals for 8 tons of lead

DC powered water heater? No way. A 12 VDC power hot water heater at say the smallest element of say 3000 watts would require 250 amps. To push 250 amps over copper cable of any distance at all without using most of the power just heating up the cable would require a copper mine to make the cable. I cannot even guess how much such a hot water heater would cost even if it were made.

So to sum it up you are talking well in excess of $100,000 to power your electric hot water heater with solar PV. Care to guess how many electric hot water heaters you can buy and how many centuries you can run them with using grid power before you would ever get an ROI?
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Old 01-31-2010, 04:25 PM
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I put two programmable stats on my boiler. One for each zone. I checked the boiler paperwork, and it told me that I needed a stat with a time delay. I called Honeywell and they told me which one of their stats would work with my boiler and controller. The controller skematic verified the correct hookup. The controller skematic was available online.
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Old 01-31-2010, 06:23 PM
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Just installed 7 Honeywell Vision Pro 8000 t'stats on Thursday. Oil fired HWBB System 2000.

I'll be programing them this week.
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