A word about Design Day and not-so-warm homes.

dabrakeman · February 13

https://forum.heatinghelp.com/discussion/comment/1887400#Comment_1887400

What did you use for a design day temperature on the dog house?

GGross · February 13

https://forum.heatinghelp.com/discussion/comment/1887724#Comment_1887724

doghouse design day = sweater+wool socks

ChrisJ · February 13

https://forum.heatinghelp.com/discussion/comment/1887787#Comment_1887787

He's got a steam system, so it's easy enough to put a steam radiator in the dog house and valve it off in the basement, just make sure it drains good enough.

Perfect solution.

Kaos · February 13

https://forum.heatinghelp.com/discussion/comment/1887698#Comment_1887698

Just to provide a real world counter point to Nate. I'm located with an outdoor design temp a couple of F warmer than Minneapolis.

Large part of the house is uninsulated double brick construction with original cast iron rads. No issues with keeping the place warm down to my design outdoor temps with an air to water heat pump without aux heat. Larger spell bellow design temp does use aux heat along with the heat pump but only because the higher temperatures the rads need.

jesmed1 · February 13

@Kaos Just curious, what ATW heat pump do you have? I looked at those for our old gravity conversion system with large cast iron rads, but the install prices we got quoted for ATW's were insane. Our design heat loss is about 100,000 BTU/hr.

hot_rod · February 13

https://forum.heatinghelp.com/discussion/comment/1887698#Comment_1887698

as I mentioned I use his data for the temperature info, not a hp selector

I look at it as a just a guide, all systems need to be designed to match equipment with the specific applications. HPs are certainly less forgiving no doubt

Maybe that is why there was a HPWH with a gas condensing burner in the lower 1/3 at AHR😗

Steve Minnich · February 18

For me, I usually stuck to the book when it came to heat loss and design days, but I can’t tell you the amount of customers I had within the City of Chicago who kept their thermostats at 84 degrees all winter long and that would be their expectation on the new boiler, usually older folks.
Then, at some point, someone else moves into that house and complains that some knucklehead installed a grossly oversized boiler. These were in poorer neighborhoods where cast iron was the only option so modulation or multiple smaller boilers weren’t an option. Outdoor reset can only do so much.

Big Ed_4 · February 18

Most lack of temperature calls are caused by added heat loss like open unused AC defusers and window units. The other is blocked radiation .. Common sense has to be learned I always say ..

This year any system installed by math will be questioned ..

Kaos · February 19

https://forum.heatinghelp.com/discussion/comment/1887798#Comment_1887798

I have a Dettson branded Gree unit:

https://www.dettson.com/en-ca/products/heat-pumps/gree-r32/versati-iv.aspx

There are larger units but you would still need multiple ones to meet your heat load. Add on the fact the your local power is very expensive, I can't see this making sense unless you are looking to split the heat to each unit and have them sub metered.

tim smith · February 24

My favorite setup John, Twin Knight boilers and 1 or 2 indirect hot water tanks. Did some this way in large residences and many in apt bldgs. Sometimes up to 4 boilers. Serves them well.

A word about Design Day and not-so-warm homes.

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