Honeywell Home RLV4305A1000 5-2 Day Programmable Thermostat for Electric Baseboard Heaters

Honeywell makes great products. Got this to replace my rental's baseboard electric heat analog control; it took me 5 minutes to replace, very simple. Now my tenant can see the temperature in the room and program, no more complaining about the room being too hot or too cold. The control does not use any battery, so one less thing to worry about.

Firstly lets quickly get this out of the way.This is a LINE Voltage thermostat.The simplest way to describe this is -its a light switch.. just switches on when it hits the temp to kick of or off.So if you're seeing 3 or 4 super thin wires this isnt the right item for you...That being said - my home is basically a hot water boiler hooked up to 2 zones and zone control is either powering on or off these water circulators.Its just a simple 120v line.I replaced two analogue mercury style thermostats and hook up is straight forward and dummy proof.The first thing before you start the replacement ... TURN OFF the Power at the breaker!This is line voltage or 120v will be uncomfortable.. or if you're 240v... yeah don't want to touch a live wire there....The thermostat is NOT polarity sensitive. That means you can join either the hot or neutral to either black wire - complete the circuit and shove everything back in.For me I used standard Wagos rather than nut connectors and replacing both thermostats was a breeze.I did have an issue with the FIRST one I bought from a big box store. The unit kept on rebooting which every 4 minutes throws out a 2.5 and 11.9 code.I tried to search what these codes mean but on the 2nd and replacement installs I noted i get these codes ON boot but the working ones just never showed those codes after boot.The Amazon shipped unit worked flawlessly and I was able to return to the big orange box store with no issues.So for anyone with LINE voltage heating or cooling - this is a great thermostat to program your wake up away and sleep ranges for the temps in the home. Better than 1 setting regardless of there is a human home or not.Super Easy DIY - just work safe! have fun!!

I've bought 3vof these so far; they're a great replacement for the old, dial thermostats.

This review is for the "new" version, RLV4305A.I got this to control a 1200W Electric Radiant Cove Heater (QMark RCC12012C) that I installed to provide supplementary heat in a bedroom. For this project, a programmable thermostat was a requirement. If I let this radiant heater run continuously, it could cost me over $100/month in electricity, just to improve the heat in one room which I am mostly not in during the day.It really is silent. The box says it uses a TRIAC, which I learned is like a dimmer. So instead of clicking off when the room gets noticeably warm and clicking back on when it gets noticeably cold, this t-stat constantly raises and lowers the dimming level to tightly track the setpoint. There is some indication of this in the display, showing 0-5 heat wave squiggles, depending on how much power it allows through.The LCD display lights up when you press a button and stays lit for 10 seconds or so. Normally, it is completely dark. Without the backlight, it is still readable if there is enough ambient light, like during the day or with room lighting on. In normal use, it displays the current time and temp, mode and period, plus the squiggles mentioned above. Touching the temp up/down button once will show the set temp.Install is straight-forward if you are familiar with household electric service.This device is installed in series with the electric heater (like a wall switch) and modulates the line-voltage AC electricity that actually passes through both the thermostat and the heater(s). There are no low-voltage control lines here like a regular household thermostat has.I don't understand why there are 4 mounting holes in the unit. I used the 2 left holes with the 2 included screws to mount it to the left half of a 2-gang electrical box. I don't get why the other 2 right holes don't line up with the holes on the right side of the box, but even like this, it is plenty firm and secure and it completely covers the box opening.Programming is easy."5-2" means you set separate Mon-Fri and Sat-Sun schedules, but nothing more sophisticated. By default, the M-F weekday schedule has 4 time periods (wake, leave, return, sleep) to program, but the Sat-Sun schedule only has 2 (wake, sleep). However, you can set times and temps for the 2 other Sat-Sun periods (leave, return) too. If you have a weird schedule you want to program, this might not be sufficient, but for most cases this should be good enough and easier to program.There are enough buttons with meaningful labels to make the work of programming it fairly easy. Rotate though the 8 periods with the "pgm" button, and change the time with the hr/min buttons and the temp with the up/down buttons. Finish/save by pressing the "⏎" button. Not rocket science.There is no "OFF" button or mode. "Manual" mode is a constant set temp like an old thermostat. The "Away" mode allows for a lower constant set temp (default 59f), presumably for extended time away from home. "Standby" mode is almost OFF, but it will turn on if the temp drops below 41f. In all the modes, it draws a tiny bit of power for itself.I have not tested this unit during an extended power outage, but it claims to remember the date/time for 5 hours or so without power. There is no battery compartment, so it must have something like a rechargeable battery or a big capacitor inside it.I'm very happy with the quality and the price is better than every other programmable line voltage thermostat that I've seen.