The Rinnai Infinity 32e and HD70E have two layers of overheat protection: a resettable bi-metal overheat switch, and beyond that, the thermal fuse assembly, which can't be reset. The fusible link sits on the heat exchanger and is the last line of defence — it only cuts power if temperature reaches 129°C, well past the point the overheat switch is designed to catch.
By the time the thermal fuse blows, something has gone seriously wrong — a fault severe enough to push temperature past the overheat switch's limit. Thermal fuses are a one-shot device: once blown, there's no reset and no workaround, only replacement. Fitting a new fuse without identifying and correcting the underlying overheat cause won't solve the problem, since the same fault will simply blow the replacement too.
The P70EV-714 is the genuine Rinnai thermal fuse assembly for both the Infinity 32e and HD70E, supplied as the complete assembly and fitted around the heat exchanger following Rinnai's servicing procedure.
⚠ Important: A blown thermal fuse is a symptom of a serious overheat event, not the root cause. The underlying fault must be identified and corrected by a Gas Safe registered engineer before or alongside replacement — fitting a new fuse alone will not prevent recurrence.
A blown thermal fuse on a 32e or HD70E means the appliance won't run again until it's replaced — but replacing it in isolation, without tracing what pushed the heat exchanger to 129°C, just sets up the same failure to repeat. Fit the genuine assembly correctly around the heat exchanger and get the root overheat cause sorted at the same time, and the safety circuit is properly restored rather than papered over.
Order the Rinnai P70EV-714 Thermal Fuse Assy 32e/HD70e online today.
| Manufacturer | Rinnai |
|---|---|
| Part Number | P70EV-714 |
| Product Type | Thermal Fuse Assembly (Fusible Link) |
| Compatible Models | Rinnai Infinity 32e (REU-V3232W) & HD70E (REU-VRM3237) |
| Activation Temperature | 129°C |
| Mounting Location | Wrapped Around the Heat Exchanger |
| Function | Permanently Cuts Electrical Power Supply if Heat Exchanger Temperature Exceeds 129°C |
| Reset Type | One-Shot – Cannot Be Reset, Must Be Replaced Once Activated |
| Installation | Gas Safe Registered Engineer Required |
