Kiln Controller Upgrade Parts: Which Controller, SSR & Heatsink?
Most single-phase electric kilns up to 50A can be upgraded to a modern programmable PID controller with just a few parts: a Novus controller, a Novus DC-input solid state relay (SSR) on an EMAS heatsink and, only where needed, a thermocouple. This guide shows which parts to choose for your kiln, and lists the kiln brands our customers most often upgrade.
For the background on how kiln control works, see Kiln Temperature Control. For a worked example, see Upgrading a Cromartie Hobbycraft Kiln.
Before You Order
- Check the kiln's rating plate for its power (kW) and phase.
- Work out the current: amps = kW x 1000 / 230. A 3kW kiln draws about 13A; a 6kW kiln about 26A.
- Check whether the kiln already has a thermocouple, and which type (K, S or R).
- Three-phase kilns, or loads above 50A, need a different setup. Contact us first.
1. Choose A Controller
All three are 230V models with ramp & soak programming.
| Controller | Best for |
|---|---|
| Novus N1050-PR | Most kiln upgrades: ramp & soak programs, SSR output plus an alarm relay |
| Novus N1050-PRRR-485 | Extra relays (vent fan, alarm, end-of-firing signal) and RS485 |
| Novus N20K48 | Bluetooth setup and monitoring from a phone, plug-in ClickNGo modules |
2. Choose An SSR And Heatsink
The SSR switches power to the elements and is sized to the kiln's current. Always mount it on the matching heatsink: an SSR running near its rating without one will overheat and fail.
| Kiln current | Solid state relay | Heatsink |
|---|---|---|
| Up to 16A | Novus 25A DC-input SSR | EMAS SSS2X |
| 16A to 30A | Novus 40A DC-input SSR | EMAS SSS4X |
| 30A to 50A | Novus 60A DC-input SSR | EMAS SSS5X |
3. Thermocouple: Only If Needed
If the kiln already has a working thermocouple, keep it. The controller is simply set to match its type (K, S or R). Kilns with a kiln sitter or an older analogue (energy regulator) control have no thermocouple, so add a Type K ceramic kiln probe. You'll also need one if the existing probe has failed.
Prefer one box? The N1050 Kiln Upgrade Bundle includes the controller, a 25A SSR and a Type K probe, and suits kilns up to 16A.
Kilns Our Customers Have Upgraded
Kiln brands our customers have upgraded or asked about include:
| Kiln brand | Typical models | Notes |
|---|---|---|
| Cromartie | Hobbycraft 40 / H45, CTL40 | 13A plug-in, about 3kW: 25A SSR + SSS2X. Kiln-sitter models need the Type K probe. See our Hobbycraft guide |
| Skutt | Older kiln-sitter models | Single phase; size the SSR from the rating plate. Needs the probe |
| Evenheat | 3220 and similar | About 18A: 40A SSR + SSS4X |
| Nabertherm | Older Top-series and enamelling kilns | Single-phase models; the existing thermocouple can usually stay |
| Pilling | Older pottery kilns, about 6kW | About 26A: 40A SSR + SSS4X |
| Laser Kilns | Flat-bed glass and enamel kilns | Replaces older CAL 3300 type controllers; keep the existing thermocouple |
| Prometheus | PRO-7 and similar | Glass, jewellery and metal clay firing |
The same parts also replace failed Stafford, CAL and Firemaster kiln controllers.
Brand names are used for compatibility reference only. Production Automation is not affiliated with these manufacturers.
Safety Notice ⚠
Kiln controls are connected to mains electricity. Isolate the kiln before opening any panel, and if you are unsure how to proceed, have a qualified electrician or competent person carry out the work. See also our PID Temperature Safety guide.
Full terminal-by-terminal wiring is covered in the PID Bundle Guide: Wiring & Setup.
Frequently Asked Questions
Which parts do I need to upgrade my kiln?
Always a controller (N1050-PR, N1050-PRRR-485 or N20K48) and an SSR with its heatsink, sized to the kiln's current. Keep a working thermocouple: the controller is set to Type K, S or R to match. Add the Type K ceramic probe only for kiln sitters, older analogue controls, or a failed probe.
Will this replace the kiln sitter on my Cromartie Hobbycraft 40 or H45?
Yes. The Hobbycraft range is a 13A plug-in kiln of about 3kW, well within the 25A SSR. The controller can replace the kiln sitter completely, or you can keep the sitter and a cone as a backup high-temperature cut-off.
Is it suitable for my Skutt, Evenheat or Nabertherm kiln?
Yes, for single-phase models up to 50A. Work out the current (amps = kW x 1000 / 230) and pick the SSR: 25A up to 16A, 40A for 16-30A, 60A for 30-50A. Three-phase kilns need a different setup, so contact us first.
My old Stafford, CAL or Firemaster controller has failed. Can this replace it?
In most single-phase kilns, yes. You can usually keep a working Type K, S or R probe. Send us a photo of the old controller and its wiring and we'll confirm.
Does it work for glass fusing and enamel kilns, like Laser Kilns or Prometheus?
Yes. Program the ramp, process and anneal holds into a stored program. Choose Pre-Programming Of Novus Devices and tell us your schedule, and we'll set it up before dispatch.
Need help choosing? Call us on +44 (0)1824 520565 or use the contact form. Back to the Knowledge Base.