Question 1

Will this work with a 3 wire boiler system ?

Accepted Answer

NO

Question 2

The manual mentions enabling heat pump but i see no option in the tech menu, anyone know how to enable it? Both heaters are turning on simultaneously.

Accepted Answer

I assume you have an axillary electric resistance heat strip/module which is meant to be activated when the mode switch is in the "EMH" position. It should only be used when the temperature is below the effective range of the heat pump.  Generally that is somewhere between 0 F and 32 F depending on the type and efficiency of your unit. In the standard heat pump mode the thermostat should be set in the "heat" position which is basically the AC running in reverse without any axillary resistance heat. When the temperature goes below freezing the reverse AC mode will not produce adequate heat at which point you activate the axillary resistance heat by switching to the "EMH" position. I am confused when you say "both heaters are turning on simultaneously.  Do you mean the heat pump is working to produce heat in addition to the resistance heat module of does your air handler have two resistance heat modules? You should consult the color codes specified in your air handler installation documentation and see if it correlates with the thermostat literature color codes. You should have one wire which activates the heat mode of the heat pump and another wire which activates the resistance heat module independent from the heat pump but still utilizing the fan induced air flow within the air handler. A simple solution might will be that you need one more wire in the thermostat signal cable. This is a common problem when a newer heat pump unit was installed as an upgrade to a standard central air system or even an upgrade to a heat pump without axillary heat. Sometime the axillary heat  module is added to a heat pump at some point later than the initial install. I hope all my gibberish is somewhat helpfull.

Question 3

Can i use this in a R.V

Accepted Answer

Most likely in a city or town

Question 4

I have to turn the emergency heat on manually with my current thermostat. Is this the same way?

Accepted Answer

I think So There are 2 position heat, and Aux/Emergency

ASIN	B09N6DFVYN
Additional Features	Low Battery Indicator, Programmable, Temperature
Best Sellers Rank	#60,796 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in Home Nonprogrammable Thermostats
Brand Name	Suuwer
Color	Off-white ( Blue Backlight )
Control Method	Push Button
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.5 4.5 out of 5 stars (184)
Display Type	Digital
Included Components	Suuwer SW721 Heat Pump Thermostat, Two screws and anchors, Operation Manual, Installation Manual, Cable Label
Item Dimensions D x W x H	0.98"D x 4.72"W x 3.86"H
Manufacturer Part Number	S721
Material Type	Plastic
Model Number	S721
Mounting Type	Wall Mount
Power Source	Battery Powered
Product Style	Non-Programmable Heat Pump Thermostat
Shape	Rectangular
Specific Uses For Product	Heat Pump
Temperature Control Type	Non-Programmable
Unit Count	1 Count
Voltage	24 volts

Suuwer Non-Programmable Heat Pump Thermostat for Home Up to 2 Heat/1 Cool

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