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 Post subject: Heating system upgrade
PostPosted: Thu Mar 02, 2017 1:37 pm 
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My mother's 26 year old Netaheat Profile decided the contents of the HEX were better placed on the utility room floor last night so she is now looking for a new boiler. Somewhat disappointing end to 26 years of loyal service, and without a single part replaced since manufacture.

I already have an Intergas and I've told her that is what she should be getting. I've already got a platinum installer lined up to take a look early next week. I was looking for some opinions on the rest of the system. An entirely new system was fitted at the same time as the boiler (26 years ago), to replace a floor standing Potterton Diplomat.

The house is a large 4 bedroom detached house (big rooms), single bathroom with a large corner bath & separate shower cubical, 1 downstairs toilet, Kitchen & utility. The current system appeared to struggle to heat the house. I installed a wireless stat in the hallway at Christmas and the system struggled to achieve more than about 17 degrees

Current System:
Netaheat Profile 80e
S Plan with Honeywell Controls
Open Vent c
Vented hot water cylinder
Drayton TRV3 on all radiators
14 Radiators

- After a drain down a few years ago by someone installing a towel rail, I've never felt the system ran right again, I suspect a lot of crap ending up being disturbed and pushed round the system. The FE pipe was blocked and had to be cleared as the system couldn't be refilled. The pump was also set too high after (3) and I suspect it was over pumping until relatively recently.
- After turning the pump (settings 2) down a lot less air seemed to gather in the system + quieter.
- The boiler used to noticeably kettle also suggesting there was a lot of crap in the system.
- System was noisy on pump over run (only had a manual bypass installed)
- Struggled to warm some rooms
- Until Christmas there was no room stat - this used to cause the boiler to short cycle excessively
- It takes an excessive amount of time for hot water to reach the utility & kitchen sink. The pipes run in the floor slab between utility and kitchen.
- Some of the TRV3 have reached the end of their working lives.

My initial thoughts:
Convert system to sealed and lose FE tank in loft and cold water tank
Feed downstairs taps from the boiler (Combi version)
Unvented cylinder for bathroom
Resize/oversize the radiators

I appreciate the unvented cylinder is probably a bit overkill (my mum lives alone), but it's a large house with a large bath and I think a combi will struggle to fill it in a reasonable amount of time.

I am just interested in other peoples view, I will be passing mine on to the heating engineer and leaving in his capable hands, but always interesting to hear different ideas for 'skinning the cat'

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PostPosted: Fri Mar 03, 2017 9:48 am 
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My present property is about the same age but 3 bed; the boiler was replaced about 6yrs ago, condensing but open vented Y plan, the rads worked but were old fashioned and some small, hence the previous owner also had electic heaters for the kids rooms. I wanted to upgrade the rads as the boiler was not overworked, I did most single to double but some were odd widths and I had to re-do pipe work, now if your Ma's rads are standard widths, I would consider changing them along with TRV's which can be got very reasonable, unlikely the mounting brackets will line up so that is extra work and not so easy on stud walls. Most of the system crud will be in the sumps of the rads and expansion tank and very little in the pipes.

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