For measuring chimney draft, choose a manometer that can read low pressure in a suitable unit, such as inches of water column, and follow the appliance manufacturer’s test procedure. Of these options, the TEKCOPLUS is the most flexible for unit selection, while the Mark II 25 is the listed liquid-filled choice with a stated 3-inch-water-column specification. EHDIS, Leaton, and RISEPRO offer digital dual-port measurement for differential pressure checks. Confirm that a device’s range and resolution suit the specific draft measurement before buying.
| Product | Best suited for | Key listed feature |
|---|---|---|
| TEKCOPLUS Dual-Port Manometer | Users who need multiple pressure units | 11 selectable units and data functions |
| Mark II 25 Liquid Filled Manometer | Users seeking a liquid-filled gauge | 3-inch-water-column specification |
| EHDIS Digital Manometer | General differential pressure checks | Dual-port measurement and ±2.999 psi range |
| Leaton Dual-Port Manometer | Users prioritizing a backlit display | Large backlit LCD and dual-port measurement |
| RISEPRO Digital Manometer | Users needing a simple dual-input gauge | 0.001 psi resolution and ±2.000 psi range |
TEKCOPLUS Dual-Port Manometer
Best for: Buyers who want several displayed pressure units and built-in data functions. The TEKCOPLUS measures pressure from a single pipe or the difference between two pipes, which makes it a flexible option for pressure troubleshooting and ventilation checks.
Its listed 11 selectable units include inches of water column, millimeters of water column, pascals-related units such as kPa, and psi. It also has data hold, maximum, minimum, and average functions, a backlit LCD, a low-battery alarm, and automatic power-off.
For chimney-draft work, the selectable inH2O unit is relevant, but the supplied product details do not state the instrument’s pressure range, resolution, or accuracy. Check those specifications against the expected draft and the appliance’s test procedure before selecting it. Choose this if unit flexibility matters; avoid assuming that unit selection alone guarantees suitability for low-pressure draft readings.
Mark II 25 Liquid Filled Manometer
Best for: Buyers looking specifically for a liquid-filled pressure gauge with an explicitly listed water-column specification. The product is described as a 3-inch-water-column manometer with stated accuracy of ±3%.
The listed features include inclined and vertical tubes, an enlarged scale, a built-in spirit level, an overflow tank, and leak-resistant O-ring seals. Its red fluid is described as low-evaporation and intended to suit cold environments. Those details may appeal to users who prefer a visible liquid-column format over a digital readout.
The main limitation is that the listing does not provide further scale or installation details in the supplied information. Check how the gauge is mounted and read, and confirm that its stated range and accuracy meet the required chimney-draft procedure. Choose this if a liquid-filled instrument and the stated 3-inch-water-column specification fit your needs.
EHDIS Digital Dual-Port Manometer
Best for: Buyers who want a handheld digital instrument for single-pipe or differential pressure measurement. EHDIS lists uses including gas-pressure troubleshooting, ventilation and air-conditioning checks, and service testing on domestic boilers.
The stated selectable range is ±2.999 psi. Listed accuracy is ±0.3% of full-scale output at 25°C, with repeatability of ±0.2% and a maximum of ±0.5% of full-scale output. The product description also notes a 32-bit microcontroller and 24-bit analog-to-digital converter.
For chimney draft, consider whether the range and displayed units provide appropriate resolution at the low pressures involved. The supplied features do not specify the smallest displayed increment or list a water-column unit. Choose this if general gas-pressure and differential checks are a priority; verify its low-pressure suitability before using it for a draft measurement.
Leaton Dual-Port HVAC Manometer
Best for: Users who value a backlit display and want one instrument for differential pressure and broader HVAC or gas-system troubleshooting. Its dual-port design measures pressure in a single pipe or the difference between two pipes.
The listed measuring range is ±20.68 kPa, equivalent to ±2.999 psi. The product specifies ±0.3% full-scale accuracy at 25°C, repeatability of ±0.2% with a stated maximum of ±0.5% of full scale, and linearity/hysteresis of ±0.29% of full scale. Its display is backlit and described as 4.45 cm by 4.95 cm.
Choose this if a clearly illuminated screen is useful in your work area and the stated range fits your measurement needs. The supplied information does not list a water-column display unit or the instrument’s resolution, so verify both before relying on it for low-pressure chimney draft readings.
RISEPRO Digital Air Pressure Meter
Best for: Buyers seeking a digital dual-input gauge with a stated pressure range and resolution. RISEPRO lists a ±2.000 psi measurement range, 0.001 psi resolution, and ±0.3% full-scale accuracy.
The two inputs allow differential pressure measurement. The listing also states a maximum pressure of 10 psi, while noting that the device may not show readings when pressure is over 2 psi. That distinction matters: the maximum pressure it can resist is not the same as its stated measuring range.
For chimney-draft use, confirm that the resolution and available units are appropriate for the specific test. The supplied features do not identify a water-column unit. Choose this if the stated digital range and dual-input design suit your pressure checks; do not treat the 10 psi resistance figure as an expanded measurement range.
Buying Guide: How To Choose A Chimney-Draft Manometer
Does the pressure range fit the draft measurement?
Start with the expected pressure range for the appliance and the procedure you will follow. A gauge’s maximum pressure tolerance is not necessarily its readable range. For example, the RISEPRO listing gives a ±2.000 psi measurement range and separately says it can resist up to 10 psi, with a warning that readings may not show above 2 psi.
When checking chimney draft, an instrument should be suitable for the low pressures involved. A tool with a broad range may not provide the useful resolution you need near the bottom of that range. Review both the stated range and the smallest displayed increment rather than comparing range alone.
Which pressure unit should the display use?
Use the unit required by the appliance manufacturer or the applicable test procedure. Inches of water column are commonly used for low-pressure appliance measurements, but the supplied product features do not list that unit for every digital model. TEKCOPLUS specifically lists inH2O among its selectable units; the other digital product details here do not state a water-column display option.
Do not assume that a device can display a particular unit just because it measures pressure. If you plan to convert readings, use a reliable conversion method and preserve the original measurement and unit in your notes.
Is a digital or liquid-filled gauge a better fit?
A digital dual-port manometer can display a numerical result and compare pressure at two ports. Some models also list functions such as data hold, maximum/minimum readings, averaging, or a backlit display. Those features can be useful, but verify the specific model’s range, accuracy, and units first.
A liquid-filled instrument presents pressure through a visible liquid column. The Mark II 25 is the only listed liquid-filled option and states a 3-inch-water-column specification with ±3% accuracy. Buyers should consider whether that stated range and accuracy meet their intended procedure and whether they prefer a liquid scale to digital readings.
When do dual ports matter?
Dual ports allow differential pressure measurement between two points or connections. This can be useful when a procedure calls for comparing pressure across a component or between two locations. For a single-point measurement, a dual-port instrument may still be usable, but follow the manufacturer’s instructions for connecting and closing or using the unused port.
Check the included connection accessories and operating instructions before buying. The supplied product information describes dual-port capability for several models but does not provide complete details about all included tubing or fittings.
How should accuracy and resolution affect the choice?
Accuracy describes how close a reading may be to the true value under specified conditions; resolution describes the smallest change the display can show. They are not interchangeable. EHDIS and Leaton state ±0.3% full-scale accuracy at 25°C, while RISEPRO lists ±0.3% full-scale accuracy and 0.001 psi resolution.
For a low-pressure measurement, full-scale accuracy can be important because the stated error is tied to the instrument’s full range. Compare specifications in the units and conditions that apply to the test. Do not infer that a higher resolution automatically means a more accurate reading.
What should buyers verify before testing an appliance?
Confirm the instrument’s operating instructions, pressure limits, units, range, and connection method. Follow the appliance manufacturer’s procedure and use a qualified technician when the work involves combustion equipment, fuel gas, or flue performance. A manometer reading by itself does not establish that an appliance or chimney is safe or operating correctly.
Inspect the instrument and its connections before use. Keep the test setup within the device’s specified limits, and do not expose a pressure sensor to pressures beyond its stated measurement or resistance limits. For installation or service decisions, use the complete prescribed procedure rather than relying on one reading.
Frequently Asked Questions
Can any digital manometer measure chimney draft?
No. The instrument must have a suitable low-pressure range, useful resolution, and the pressure units required by the test procedure. Check the model’s specifications rather than assuming every HVAC manometer is appropriate for chimney draft.
Which listed manometer explicitly offers inches of water column?
TEKCOPLUS lists inH2O among its 11 selectable units. The supplied feature lists for EHDIS, Leaton, and RISEPRO do not identify a water-column unit.
Is a 10 psi maximum pressure the same as a 10 psi measuring range?
No. A pressure-resistance limit indicates what the instrument may withstand, while its measurement range indicates the pressures it is specified to measure. RISEPRO lists a ±2.000 psi measurement range and separately states a maximum pressure of 10 psi.
Should I choose a liquid-filled or digital manometer?
Choose based on the test requirements and the instrument’s specifications. The listed liquid-filled Mark II 25 states a 3-inch-water-column specification and ±3% accuracy. Digital models offer numerical displays and, depending on the model, dual ports or data functions.
Can a manometer reading confirm that a chimney is safe?
No. A pressure reading is only one measurement and cannot by itself confirm safe chimney or appliance operation. Follow the appliance manufacturer’s procedure and have combustion or venting work performed by a qualified professional when appropriate.