Replacing an existing Hob and Hood: Yes, No, Maybe?

When to replace your Hobs?

Most useful article I found from realliving. 

1. The burners don't heat up properly. The flame it produces is no longer blue or sparks from blue to red to yellow. Attempt clean the grates and burner caps. If your stove top is clean and flame is still not burning blue, it may be time for repairs.
2. You smell gas. Check tubings or ask for help!
3. Control panel doesn't work - more applicable to electric stoves. Buttons that no longer work or malfunction prevent you from cooking properly. Opt for replacement. 
4. Crack on surface especially those glass stovetop. Must be replaced immediately. Not safe for cooking
5. It doesn't turn on. Maybe due to faulty spark igniters. Easily remedy this with a gas lighter. Electric stove may be due to lose wiring. Loose wiring is a fire hazard and must be rectified immediately.

Things to note when buying hobs. 

• flame safety device. i.e when the flame goes out the gas is automatically cut. 
• popular brands are rinnai/ fujioh/ techno
• big brand names are bosch, turbo, brandt but expensive

There is also the inner flame hob by rinnai which I am quite keen on.  But reviews from users seem to indicate that the stove will rust after a year of use. For the stove frame as well as the burners. 

When to change your hood?

After reading the write-up from pew pew pew about recirculating hoods and hence it makes no sense to buy expensive hoods. Get a hood as cheap as possible. 

A recirculating hood works by using metal filters to absorb grease and charcoal filters to absorb odour. The air is then recirculated into the kitchen. However, charcoal filters reduce airflow by almost half. And then you realise that there’s no room to put a large blower into the slim hood design. The result is weak suction power. This is typically calculated in cubic feet per minute (CFM) or cubic meter per minute (CBM). A 800-1000 CFM recirculating hood efficiency is reduced by 50% due to the carbon filters etc.

Own notes:
Existing Hood Electrolux EFP9520X 
Dimensions from internet: W x H x D 898 x 175 x (260 x 460)

Own measure using measuring  tape: W x H x D 895 x 325 x 172

Existing Hob Elextrolux EHG9330X

Dimensions from internet: W x H x D 832 x 57 x 470 

W x D: 862 x 500

Should be a 90 cm Hob

The hood is still working just need to find replacement for carbon filters. 

The hob flame is blue / orange. The spark has failed to work now using gas lighter to resolve. The burner caps and burner has shown signs of rust. No safety issue as yet. So will live with the hob still.