Every commercial kitchen OEM eventually qualifies a second source for capillary thermostats: lead times slip, a variant is discontinued, or a custom version — a different setpoint, a longer capillary, your own dial print — sits behind a bespoke-run MOQ far above your production volume. EGO and Robertshaw have supplied this market for decades and their controls are proven. But “equivalent” is a technical claim, not a label. This guide sets out the parameters that must match before an alternative goes onto your equipment, and how we map the V.Crown range against the specifications buyers send us.
Control or limiter? Start with the function
The first split is functional. A control thermostat cycles the heater to hold a set temperature and resets automatically. A safety limiter (hi-limit) does nothing until the control fails: it trips at a fixed temperature and, on commercial cooking equipment, stays open until it is reset by hand. The two are never interchangeable, and a credible alternative supplier must offer both halves of the pair — control and limiter — matched to the same appliance. Our range pairs the AG16-K control with the AG16-S limiter, the AG32-3K three-pole control with the AG32-3S limiter, and auto/manual versions in the GAS SERIES for gas appliances.
The nine parameters that define an equivalent
- Temperature range or trip point — an adjustable range for controls (fryers typically work between 50 and 200°C); a fixed, factory-set trip point for limiters
- Current and voltage rating — 16A/20A at 110V/250V covers most single-phase equipment; three-phase loads need a multi-pole device
- Contact form and poles — SPST for a single circuit, SPDT when a pilot lamp or alarm shares the switch; single-, double- or three-pole
- Reset type — automatic for controls, manual for safety limiters on commercial cooking equipment
- Capillary length — measured along the real routing path from bulb to panel, with service slack
- Bulb dimensions — diameter and length must seat correctly in the existing thermowell
- Terminals — spade size and orientation, so the existing harness connects without rework
- Mounting and shaft — bezel, bracket and shaft geometry must fit the existing panel cut-out
- Medium — electric controls switch the heating circuit directly; gas appliances use millivolt (micro-current) controls and safety stats on the thermocouple circuit
Miss one of the nine, and the part is not an equivalent — it is a redesign. Send us the rating label or the old part and we check all nine before quoting.
Cross-reference by specification
Buyers usually send a competitor part number; we cross-reference by specification, not by the number alone, because one series covers dozens of variants. Typical mappings:
| Function | Typical specification to match | V.Crown equivalent |
|---|---|---|
| Control — fryers, ovens, griddles | Adjustable, 300–400°C class, 16A/250V, SPST/SPDT, auto reset | AG16-K — 50–400°C, 16A/20A, 110V/250V |
| Control — compact panel space | Same ratings, compact body | AGO SERIES — 50–400°C, 16A/20A |
| Safety limiter — fryers, ovens | Fixed trip, manual reset, 16A class | AG16-S — trip points 380/400/430°C, 16A/20A |
| Control — three-phase equipment | Three-pole switching, high current | AG32-3K — 3-pole, 16A/32A/50A, 50–350°C |
| Safety limiter — three-phase | Three-pole, manual reset, trip up to 400°C | AG32-3S — 3-pole, manual reset |
| Gas control & safety stat | Millivolt circuit, 125–300°C class | GAS SERIES — 0.67A · DC 5V micro-current, auto reset (control) / manual reset (safety) |
EGO® and Robertshaw® are trademarks of their respective owners. This guide is an independent cross-reference by specification; HengTherm is not affiliated with either company.
Certifications: ask for numbers, then verify them
An alternative part goes into certified equipment, so its approvals must be real and checkable. Ask any supplier for certificate numbers — not logos — and verify them in the certifier’s public database. Our production is TÜV Rheinland certified, certificate no. R 50309054, independently verifiable on Certipedia, and models carry the approvals listed for each series (TÜV / CE / UL / KC as applicable). If a quotation cannot produce a certificate number, treat the approval claim as unproven.
Customisation and MOQ: where a second source wins
The most common reason buyers come to us is not price — it is the bespoke run. A non-standard trip point, a capillary cut to your routing, a dial printed with your brand: at the large manufacturers, custom variants sit behind MOQs set for mass production, often far above an equipment maker’s demand for that variant. As a specialist maker building capillary thermostats since 1995, we configure range, trip point, capillary length, bulb and knob to order, and private labelling is routine. Tell us the variant and the expected volume, and we quote the MOQ honestly against it.
Qualify before you switch
Follow a disciplined path: send the specification or the old part; receive the cross-reference in writing; bench-test samples against your appliance’s duty cycle; run a small trial order through your normal vendor assessment; then release for production. We support every step — samples, a video or in-person factory audit, and trial orders are standard practice for us. Start with the Capillary Control Thermostats and the matching Manual Reset Safety Limit Thermostats, or send us the part number you currently buy and we will map it.
How to Choose a Capillary Thermostat · Capillary Control Thermostats