---
product_id: 62115355
title: "Baxi combi 80E & 105E DHW Domestic Hot Water Diaphragm, Repair Kit 5111137"
brand: "baxi"
price: "€ 13.47"
currency: EUR
in_stock: true
reviews_count: 8
category: "Baxi"
url: https://www.desertcart.fi/products/62115355-baxi-combi-80e-and-105e-dhw-domestic-hot-water-diaphragm
store_origin: FI
region: Finland
---

# Compatible with multiple Baxi models 15-min DIY quick fix Precision-fit diaphragm kit Baxi combi 80E & 105E DHW Domestic Hot Water Diaphragm, Repair Kit 5111137

**Brand:** baxi
**Price:** € 13.47
**Availability:** ✅ In Stock

## Summary

> ⚡ Fix your hot water woes fast — DIY like a pro, save like a boss!

## Quick Answers

- **What is this?** Baxi combi 80E & 105E DHW Domestic Hot Water Diaphragm, Repair Kit 5111137 by baxi
- **How much does it cost?** € 13.47 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/62115355-baxi-combi-80e-and-105e-dhw-domestic-hot-water-diaphragm)

## Best For

- baxi enthusiasts

## Why This Product

- Trusted baxi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Broad Compatibility:** Seamlessly fits Baxi Combi 105HE, Main Combi 24HE & 30HE, plus Potterton Performa 24 Eco HE models.
- • **DIY-Friendly Design:** Comes with straightforward installation steps supported by abundant online tutorials—save on costly repairs!
- • **Compact & Lightweight:** At just 18g and a sleek matte finish, it’s a discreet yet essential upgrade for your boiler system.
- • **Durable & High-Quality:** Crafted as a premium compatible replacement part to ensure long-lasting performance and reliability.
- • **Effortless Hot Water Revival:** Restore your boiler’s hot water flow in just 15 minutes with this easy-to-install diaphragm kit.

## Overview

The Baxi 5111137 Diaphragm Repair Kit is a high-quality compatible replacement designed to restore domestic hot water function in select Baxi and Potterton boilers. Lightweight and easy to install, it fits multiple popular models and offers a cost-effective, durable solution for common diaphragm failures, empowering confident DIY repairs and avoiding expensive service calls.

## Description

Product description Please read full part description before purchase! Any questions don't hassle to ask us - BoilerParts24. Baxi Main Potterton Alpha Domestic Hot Water Diaphragm DHW Repair Kit 5111137 Fits to 248061 248062 248063 6.1000765 1000765 Diverter Valve. Legal Disclaimer ⚠ This is High Quality compatible part.

Review: Cheap and does job perfectly - £5 fix , 15min job sorted. Had a main 30he for now 20 years been a great boiler but this is the 3rd diverter valve diaphragm I've changed. They just perish get a hole in and stops the pin being pushed all the way out to engage micro switch for hot water. Loads of videos out there for any DIYers save your money.
Review: These parts can get the job done-if you know what you're doing. - This is exactly what you need to get your hot water back on again. Tip: If the little brass nut that guides the plunger onto the micro switch is the only bit that's leaking, just change that! If your hot water is not heating then the diaphragm is easy to fit, there are YouTube videos showing how to do it. I watched a few of them first before going in! Make sure the power is off and the water supply taps on the boiler are turned off before you start. A bit of water will come out, not much so put some thing underneath like a bowl or towel. Carefully unscrew and remove the micro switch and place it to the side out of the way. Carefully loosen the little copper pipe that goes in to the housing at the top and lift it out of the housing. Next loosen the six screws while holding both sides of the housing together firmly,undo them fully while gently letting the spring pressure expand in your hand, remove the screws. Let the housing open up and remove the spring, the front plunger should be in place in the housing. You can now remove the "mushroom" and diaphragm and mushroom note how it all fits together (if you have no hot then the diaphragm will usually be perished or split but if you are this far in replace it anyway) clean up the faces of the housing and plungers with a cloth and silicone grease all the components before reassembling. Carefully reposition the rear plunger on the mushroom through the diaphragm centrally as you don't want to damage that bit. You should now be left with the little O ring which is what the rear plunger goes through. This has to be fitted BEHIND the brass nut plunger guide that is located on the REAR of the housing (similar to the one on the front) and although simple enough to fit it requires you to dismantle the diaphragm housing from the rest of the diverter valve block ( it's held in place with two flat head brass grub screws) , easy enough to get off but lots of swearing to get back on, in position and tight. If you have to remove the front bit then carefully loosen and remove the rear little copper pipe from the housing, then undo the retain screws on the sides they're at about 1 o'clock and seven) don't remove them fully - just enough to release the front housing. I only found one video on YouTube which actually shows this so again, if it's NOT leaking from the back plunger then leave well alone! May I add that I only attempted this fix because of the pandemic my British Gas service cover would only send an engineer out if we had NO heating or hot water but not for a leak, I am a medical engineer (30 years in) and this stuff is not a million miles away from what I do for a living so I'm not without a clue. Also may I add this is purely mechanics/hydraulics and about as basic as it gets. If there was gas involved then under absolutely no circumstances would I have attempted to do this! So if you feel competent and confident then do the replacement but if in any doubt please bite the bullet and get a professional to do the job. If you use the wrong tools or over tighten stuff then it could turn in to a very expensive repair just when you thought it was going to save you a few quid!

## Features

- Baxi 5111137 Diaphragm Replacement Kit DHW, Fits Boiler Models Baxi Combi 105HE, Main Combi 24HE and 30HE and Potterton Performa 24 Eco HE

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003R087NM |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 36,944 in DIY & Tools ( See Top 100 in DIY & Tools ) 386 in Central Heating System Accessories |
| Colour | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (352) |
| Date First Available | 10 Jun. 2010 |
| Finish | Matte |
| Item Package Quantity | 1 |
| Item Weight | 18.1 g |
| Item model number | 5111137 |
| Manufacturer | Baxi |
| Package Dimensions | 7.9 x 7.9 x 1.2 cm; 18.14 g |
| Part Number | 5111137 |
| Pattern | Solid |
| Style | Vintage |

## Images

![Baxi combi 80E & 105E DHW Domestic Hot Water Diaphragm, Repair Kit 5111137 - Image 1](https://m.media-amazon.com/images/I/31nWT5QTusL.jpg)
![Baxi combi 80E & 105E DHW Domestic Hot Water Diaphragm, Repair Kit 5111137 - Image 2](https://m.media-amazon.com/images/I/61Rpusp6+yL.jpg)

## Questions & Answers

**Q: Where does the small rubber o ring go?**
A: HI. 
This goes and the back off the unit. There is a small nut at the back off the front piece it goes under this nut.

**Q: Does this definately work on baxi 105e ? I have no hot water but central heating works. Thanks**
A: This works fine. Its worth getting the big and small diaphragms at the same time, then you've got them. The big diaphragm is simple to change. The smaller diaphragm is harder (the side panel of the boiler needs to come off to gain access),  but both are quite doable. Just make sure that you clean all the parts you are reusing.

**Q: How do I fit this product?**
A: You get competent boiler repair person

**Q: Is their a blue baxi name button that clips onto boiler?**
A: Not that I’m aware off this is just as displayed on photo

## Customer Reviews

### ⭐⭐⭐⭐⭐ Cheap and does job perfectly
*by C***R on 7 December 2025*

£5 fix , 15min job sorted. Had a main 30he for now 20 years been a great boiler but this is the 3rd diverter valve diaphragm I've changed. They just perish get a hole in and stops the pin being pushed all the way out to engage micro switch for hot water. Loads of videos out there for any DIYers save your money.

### ⭐⭐⭐⭐⭐ These parts can get the job done-if you know what you're doing.
*by S***M on 29 January 2021*

This is exactly what you need to get your hot water back on again. Tip: If the little brass nut that guides the plunger onto the micro switch is the only bit that's leaking, just change that! If your hot water is not heating then the diaphragm is easy to fit, there are YouTube videos showing how to do it. I watched a few of them first before going in! Make sure the power is off and the water supply taps on the boiler are turned off before you start. A bit of water will come out, not much so put some thing underneath like a bowl or towel. Carefully unscrew and remove the micro switch and place it to the side out of the way. Carefully loosen the little copper pipe that goes in to the housing at the top and lift it out of the housing. Next loosen the six screws while holding both sides of the housing together firmly,undo them fully while gently letting the spring pressure expand in your hand, remove the screws. Let the housing open up and remove the spring, the front plunger should be in place in the housing. You can now remove the "mushroom" and diaphragm and mushroom note how it all fits together (if you have no hot then the diaphragm will usually be perished or split but if you are this far in replace it anyway) clean up the faces of the housing and plungers with a cloth and silicone grease all the components before reassembling. Carefully reposition the rear plunger on the mushroom through the diaphragm centrally as you don't want to damage that bit. You should now be left with the little O ring which is what the rear plunger goes through. This has to be fitted BEHIND the brass nut plunger guide that is located on the REAR of the housing (similar to the one on the front) and although simple enough to fit it requires you to dismantle the diaphragm housing from the rest of the diverter valve block ( it's held in place with two flat head brass grub screws) , easy enough to get off but lots of swearing to get back on, in position and tight. If you have to remove the front bit then carefully loosen and remove the rear little copper pipe from the housing, then undo the retain screws on the sides they're at about 1 o'clock and seven) don't remove them fully - just enough to release the front housing. I only found one video on YouTube which actually shows this so again, if it's NOT leaking from the back plunger then leave well alone! May I add that I only attempted this fix because of the pandemic my British Gas service cover would only send an engineer out if we had NO heating or hot water but not for a leak, I am a medical engineer (30 years in) and this stuff is not a million miles away from what I do for a living so I'm not without a clue. Also may I add this is purely mechanics/hydraulics and about as basic as it gets. If there was gas involved then under absolutely no circumstances would I have attempted to do this! So if you feel competent and confident then do the replacement but if in any doubt please bite the bullet and get a professional to do the job. If you use the wrong tools or over tighten stuff then it could turn in to a very expensive repair just when you thought it was going to save you a few quid!

### ⭐⭐⭐⭐ Worth buying
*by A***R on 26 March 2019*

The price is good and it's delivered within a couple of days

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-19*