Purchase Web Energy Logger components on-line


As of April, 2024 I'll only be selling Web Energy Loggers and support components to existing customers.

Although the WEL is still extremely robust for its price point, the underlying technology is now several generations behind the state of the art. I am starting to see some components become obsolete, and key development tools are no longer supported. So to ensure that I can continue to support my existing customers with new and replacement units, I'm restricting future sales to that folks who have already purchased one or more WEL systems in the past.

For future orders from this website, I'll be verifying that the order comes from an existing custommer, and if not, I'll immediatly refund the purchase. If you need to verify your "past customer" status, feel free to email me at: phil.malone@mr-phil.com with your details (or existing WEL ID).

Thanks for your understanding.


The WELSERVER Online store will be closed between May 17 and June 21 due to my international travel.

All orders received before May 17 will be processed and shipped within 3 days. Subsequent orders will be processed in the the order they were recived, after June 21.


Here are the options and prices. Click any image for an enlargement.

WEL Starter Kit Enc. (p/n WEL-SK-ENC)

This is for someone who wants a turn-key monitoring system.  This includes the latest WEL 4.5 Processor (WEL) in a transparent enclosure with a high-efficiency plug-in power supply (WEL-PWR).  It also includes 10 Temperature Sensors, 40 feet of 24AWG twisted triad wire (BUS40-24AWG) suitable for the 1-Wire bus, plus 25 inline-crimps   Each of these components are describe below with any associated documentation.  

You can also choose from 6 different combinations of Epoxy Potted (TSENSE-POT), or 1" Stainless Steel (TSENSE-SS1-1M) temperature probes. The potted sensors are great for measuring air temperatures, and the Steel ones are easy to strap to pipes for measuring water temperature.

Price: $575 each (+ tax in MD)   (Best value with a $21 saving)

Choose Sensors BEFORE adding.
The WEL (p/n WEL)

The bare minimum WEL purchase is just the WEL 4.5 Processor mounted in a custom transparent enclosure (same as the one used in the starter kit).  You don't need to purchase anything else from me.  I'll show you exactly what else you need to build your system, from wiring, to temperature sensors and Watt meters.   The WEL will come fully programmed and ready to post data.  

 Download the User Guide
Price: $435 each (+ tax in MD)

WEL Power Supply (p/n WEL-PWR)
This is a high efficiency switching power supply. It supplies 9V at 800mA. The connector is a 2.5mm Barrel Plug with center positive.
Price: $11 each (+ tax in MD)
40' Bus Wire 24 AWG (p/n BUS40-24AWG)
Three solid-copper 24AWG wires have been twisted together to make a 1-Wire bus that's well suited to the harsh conditions in a utility room. 
In addition to the standard black and yellow bus wires, a red wire is also included for future expansion, to provide the power that some sensors require.

Price: $20 each (+ tax in MD)

250' Reel: Bus Wire 24 AWG (p/n BUS250-24AWG) $100
Stainless Steel Temperature Sensor with 1M cable (p/n TSENSE-SS1-1M)
This small Stainles Steel clad sensor has a 1M (39") flexible cable for easy installation. The extended cable will offer added convenience for installers, in addition to some extra moisture resitance. It can be clamped to a pipe for robustness. This sensor is 0.25" in diameter, so it's also ideal for inserting into a thermal well on a copper pipe.   Small telecomm Tap-Splices are supplied with the sensor to easily add it to an existing 1-wire bus without stripping or soldering.
Note: The wire colors for this device are NOT-Logical. Red is Gnd, and Black is the 1-Wire Bus. Wiring Tips
Price: $12 each (+ tax in MD)
Potted Temperature Sensor (p/n TSENSE-POT)
This Potted Sensor provides a low cost option for air temperature monitoring. The sensor head has a diameter of only 0.25" and the length of the potted section is just over 1". The rugged jacketed cable is approx 3ft long. The epoxy is hardened and waterproof, and completely covers the sensor and solder joints, allowing this sensor to be used in harsh conditions. Although great for measuring both water or air temperature, this sensor is NOT suitable for strapping to pipes, because there are no flat surfaces to ensure a good thermal coupling. Small telecomm Tap-Splices are supplied with the sensor to easily add it to an existing 1-wire bus without stripping or soldering. Wiring Tips
Price: $12 each (+ tax in MD)
Stainless Steel Temperature Sensor (Rugged) (p/n TSENSE-SS3)
This 3" long stainless steel temperature probe is 8mm in diameter and has a DS18B20 element connected to a durable jacketed cable with 2 heavy stranded conductors, all of which is completely epoxied into the probe, resulting in a high quality and rugged sensor that is water proof and perfect for a variety of commercial and industrial applications. Cable is approximately 3 feet long. Small telecomm Tap-Splices are supplied with the sensor to easily add it to an existing 1-wire bus without stripping or soldering. Wiring Tips
Price: $16 each (+ tax in MD)
8-Channel Thermostat Input Module (1-Wire). (p/n WELSTAT-8)
The WELSTAT-8 Module can monitor up to eight 24 VAC thermostat signals (STATS).

All 8 Thermostat inputs are optically isolated from the 1-wire bus, and each other.   The WEL will register a '1' state when 12-24 vac is present across a pair of input screw terminals.  Each input draws only 1mA from the 24 vac signal line it is monitoring.  This board does NOT generate the 24 vac, it simply monitors an existing control signal.  An input might be connected across the C and W1 lines of a HVAC unit's controller board to detect a Low Heat call.

Installation can be tricky, so read the User Guide, for more details.

Price: $95, or $85 without the box.  See pull down list above.  Make your selection before adding to cart. (+ tax in MD)

Simple 1-Wire Wiring Hub. (p/n WEL-HUB)

This small module makes it easy to create a star hub next to your WEL. Putting lots of solid wires into a single screw terminal isn't the best wiring practice, so instead, you can use this hub to tie several wire runs together.

It has 6 terminal blocks that are all just wired together. Two 3-wire and four 2-wire terminal blocks make it easy to form a hub, or attach in a group of sensors. Each terminal is labeled with my standard wire color code: Black (Gnd), Yellow (Bus), Red (Pwr), and there are 4 mounting holes if you want to attach it to the wall. Using a hub like this also makes it easy to disconnect a bus run for testing, or for upgrades. (Click pic for expanded view).

Note: Since this is just a passive wiring hub, you still shouldn't use it to add a long branch to an existing bus run. Splitting a long bus run part way down it's length can degrade the signal sufficianty to cause sensor reading problems.

Always have the center of a network star located right at the WEL, and keep any branches off a long run as short as possible.
Price: $17 each (+ tax in MD) 

$1 Shipping Up-charge: If required. (p/n SHIP-ONE)
If your country isn't on my shipping list, I may have you manually add the required shipping charge to your order. If this is the case, I'll just ask you to add the required number of $1 Shipping Up-charges. Price: $1 each 

Please call or email me if you need information about stock, or help with an order.
Phil Malone aka: Mr. OurCoolHouse.com  
Phone: 301 501-7424 (9:00am to 9:00pm Eastern Time)
Email: phil.malone(at)Mr-Phil.com  ...Replace (at) with @ 
US Mail: PO Box 501
Mc Henry, MD, 21541
Shipping: 124 Cherry Heights Lane
Mc Henry, MD, 21541